Special receptacle or package – With indicia or area modified for indicia
Patent
1994-06-09
1995-08-29
Fidei, David T.
Special receptacle or package
With indicia or area modified for indicia
B65D 7300
Patent
active
054452716
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a resin-made basket for thin sheets in which a plurality of thin sheets (that is, base members such as hard memory disks (magnetic disks) or compact disks (CDs), silicon wafers for producing semiconductors, or glass bases for LCD, etc.) are contained and held to be conveyed, stored, surface-treated, etc. at the same time.
DESCRIPTION OF RELATED ART
It is usual that thin sheets such as silicon wafers or compact disks are contained in a resin-made basket for thin sheets (for example, an wafer carrier) for dealing with them. The resin-made basket for thin sheets will contain and hold a plurality of thin sheets placed therein in parallel to each other at certain intervals, so that these thin plates are dealt with together.
In cases where a large quantity of thin sheets are dealt with, a large number of baskets each containing a plurality of thin sheets are used for performing conveyance, storage, surface treatment, etc. of the thin sheets with each basket being one unit. Besides being processed in a dry state, the thin sheets are processed in an wet state in which they are processed as being washed with pure water or immersed in chemical liquids. Processing in the wet state requires the basket to be immersed in pure water or chemical liquids together with the thin sheets.
On one hand, each basket requires that a bar code be put on the basket to record a history of each process (processing histories) and/or control. There have been provided as follows several means for putting the bar code on the basket. directly applied on the basket. applied on the basket by sealing with resin film. on the basket.
However, the above means for putting the bar code have a wide variety of drawbacks as follows.
In cases where a piece of paper, on which a bar code is printed, is directly applied or is applied by sealing with resin film on the basket, there is a possibility that the applied piece of paper showing a bar code will come away to fail in identification of the basket. Further, washing by liquids such as pure water, carried out before putting the basket into a processing line, might cause printing ink to come out because of the washing liquids or cause the washing liquids to permeate into a space between the paper and resin film, both of which lead to a poor reading of the bar code.
In some cases, the basket is immersed in chemical liquids in the course of a processing line; in this immersion, the piece of paper showing a bar code is once removed from the basket and will be again applied after completion of the immersion in chemical liquids. Such a manner of operation, however, might cause mistakes in recognition of lots in case a large quantity of baskets are processed.
Incidentally, in case the ceramic plate on which a bar code is baked is mounted on the basket, the ceramic plate is liable to break due to lack of flexibility and weakness for shocks.
The present invention has been done with taking the above-mentioned problems into consideration, and its object is to provide a resin-made basket for thin sheets wherein operations including processing for thin sheets are improved by using a bar code which eliminates deterioration in identification capability because of pure water, chemical liquids, etc., mistakes in lot recognition, and other sources of damage.
SUMMARY OF THE INVENTION
The present invention is characterized in a resin-made basket for thin sheets, in which a plurality of thin sheets are contained for operations including conveying, storing, and processing the thin sheets, a bar code for processing histories and control being directly written on a wall surface of the basket by a laser beam. This prevents discoloration of signs and burring in shades even when being immersed in pure water, chemical liquids, etc., so that is degradation in identification capability resulting from being unreadable is avoided. Further, there is no need for removing a bar code which might result in mistakes in recognition of lots and no damage. This enhances smooth proc
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Ikeda Kenji
Kakizaki Takeyoshi
Shiozaki Tetsuya
Fidei David T.
Kabushiki Kaisha Kakizaki Seisakusho
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