Patent Grant
6954681
The electronics assembly industry uses machines such as pick and place machines to automatically pick components from component feeders and place the components upon circuit boards during board assembly. Subsequently, the components themselves are permanently attached to the circuit board at locations where the pick and place machine has deposited them. Due the relatively high speed required for such operations as well as the extremely small-scale of the components themselves, component placement and alignment are extremely important. In order to facilitate advances in component placement and alignment, optical systems and associated processors have advanced accordingly. One common element of a pick and place system is known as the board align image acquisition device. Typically, this image acquisition device resides upon a placement head and is used to essentially image a reference position (also known as a fiducial) on the board. By determining the placement of the head via encoders, or other suitable position measuring means, associated therewith, and determining the position of the fiducial from the image supplied by the board align camera, the relative position of the placement head with respect to the board is precisely known.
The position of the component to be placed on the placement head is calculated in a similar manner but with a generally upward-looking component align (CA) image acquisition device. The component align image acquisition device generally acquires an image of the component to be placed after it has been picked up by the placement head. The host processor then determines the position of the component on the placement head and knowing the position of the placement head with respect to the board, so manipulates the component to be placed that it is oriented correctly and placed properly upon the board. Thus, a typical pick and place system includes a pair of image acquisition device (board align and component align). Due to the relatively high-speed operation of pick and place machines, there is a relatively large amount of data (both image data and control data) that passes between the host processor and the various image acquisition devices and their associated illuminators. A pick and place system that could accommodate the relatively high data transfer burdens while simultaneously simplifying wiring and reducing costs would be a significant increase in the art. Moreover, if such system could provide data transfer rate head room beyond that which is currently needed and accommodate future scalability, system implementation would be facilitated.
An electronics assembly system includes an image acquisition system that is coupled to a controller through an improved interface. The coupling facilitates advanced monitoring and control of the image acquisition system. Multiple image acquisition devices can be coupled to the controller over the same interface.
One example of such a bus is known as the IEEE 1394 Standard for High Performance Serial Bus the standards of which are published by the Institute of Electrical and Electronics Engineers Inc. Information about the IEEE 1394 serial bus standard may be found on the world wide web. The IEEE 1394 standard provides for data transmission speeds at 100, 200, 400 megabits per second and beyond over the serial bus. The format and type of information to be sent between the host and the digital camera over the IEEE 1394 serial bus adheres to the 1394 Trade Association's 1394-based Digital Camera Specification, Version 1.3, dated Jul. 25, 2000. As used herein “Specification” shall include any specification compatible, either presently or backwardly, with the IEEE 1394-based Digital Camera Specification. While the Specification listed above does not provide features which facilitate the use in pick and place machines, there is an ability provided in the Specification to add additional features. This is done via advanced control and status registers (CSR). A portion of this patent document will make reference to the Specification. Information regarding the Specification may be found on the worldwide web. Some of the features useful for device 108 but not currently set forth in the Specification follow. The Specification does not set forth an ability to control four or more illumination channels. In additional to the control of illumination, there are currently no characterization registers available to determine the capabilities of each image acquisition device. Another feature that is not provided by the Specification is the ability to set illumination counters to help determine lifetime of the illuminators themselves. Further, there is currently no storage provided by the Specification for mechanical and optical parameters that could be characterized during calibration. These features and their implementation in embodiments of the present invention will be set forth in greater detail below.
The following description sets forth a preferred embodiment in such detail that specific data values for specific control and status registers in the 1394 specification are provided.
Embodiments of the present invention use an additional CSR to provide registers for illumination control, calibration data and other unique functions. These functions are not part of the standard 1394-based Digital Camera Specification and were implemented using an advanced feature CSR Address of the advanced feature CSR is: Bus_ID, Node_ID, 0xFFFF FFF0 0000.
Status and Control Registers for the Advanced Features
Status and Control Registers for Communication Features
This status control provides a way to allocate an isochronous channel. After this control is activated, the One Shot command does not have to build-up a channel after the command. this will provide a short and predictable image intake time.
Although the present invention has been described with reference to preferred embodiments, workers skilled n the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention.
This application is a continuation application of Ser. No. 10/017,501, filed Dec. 14, 2001 now abandoned, which this application is base on and claims the benefit of U.S. provisional patent application Ser. No. 60/255,925, filed Dec. 15, 2000, entitled “CAMERA WITH IEEE 1394 INTERFACE.”
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| Number | Date | Country | |
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| Number | Date | Country | |
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| Number | Date | Country | |
|---|---|---|---|
| Parent | 10017501 | Dec 2001 | US |
| Child | 10745860 | US |
