Bar coded index tab holder
BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates to a device for holding a bar coded label on an edge of a circuit board or the like, to permit the bar coded label to be read accurately by electronic bar code reading devices. 
     2. Background Art 
     Bar code data, in the form of spaced bars contrasting with the background on which they are printed, or the like, have been known for many years. Their use became more extensive when bar code readers or &#34;wands&#34; capable of reading bar codes with very high information density became commercially available. A wand generally takes the form of a pencil-shaped element having electrical leads extending from the top of a housing and connecting internally with an optical reading head responsive to the information encoded in the bar code pattern. By simply moving across the surface of the label, the wand detects and decodes the information for display or storage. Bar codes have been used on equipment, inventoried parts, consumer goods, and a wide variety of other items. By means of bar coding, the efficiency of such processes as inventory control, production, and assembly may be enhanced. Also, bar coding may permit any organization to more easily route and keep track of large numbers of articles of any kind. 
     In the electronics industry it is common for a given facility to have a multitude of storage racks containing printed circuit (p.c.) boards. When stored in these racks, usually only one edge of each printed circuit board is visible. While use of bar coded labels on p.c. boards would greatly enhance inventory control efficiency, they generally require a wider mounting surface than that afforded by the edge of the board. Placing the label on the flat surface of the board would not be efficient because the surfaces are not accessible when the boards are stored in racks. 
     To further enhance inventory control, it would be desirable to have inventory-control or part numbers of a printed circuit board visible in both machine-readable (bar coded) and human-readable form, both accessible without removing the boards from their storage rack. 
     SUMMARY OF THE INVENTION 
     It is a feature of the invention to provide a bar code label holder which securely affixes a label to the edge of a printed circuit board for reading the label from outside a storage rack. 
     It is another feature of the invention to provide a bar code label holder which allows the reading of label information in both machine-readable and human-readable form. 
     It is a third feature of the invention to permit the reading of machine-readable bar codes by use of an optical wand, without requiring human visual contact in order to align the wand with the bar code strip. 
     The foregoing features are achieved according to illustrative embodiments of the invention by affixing to printed circuit boards index tabs capable of displaying machine-readable and human-readable identification information, comprising a base member attachable to a p.c. board or other article and including a front face, with a notch extending across the front face for affixing a label thereto, bearing machine-readable and human-readable information. In a preferred embodiment of the invention a lip is provided along each side of the notch to grip the edges of such label and to provide a guide surface whereby a reading instrument, such as a bar code wand, may be located against one of the lips for movement along the lip to accurately read the bar code information without the necessity of human visual contact with the label. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Further features and advantages of the invention will be described in connection with the accompanying drawings, wherein: 
     FIG. 1 is a side elevational view of an embodiment of a bar coded index tab attached to a printed circuit board, showing the position of an optical reading wand in phantom view; 
     FIG. 2 is a front elevational view of a bar coded index tab affixed to the end of a printed circuit board as in FIG. 1; 
     FIG. 3 is a partially cut-away plan view of the bar coded index tab affixed to a printed circuit board as in FIGS. 1 and 2; 
     FIG. 4 is a side elevational view of an alternate embodiment of a bar coded index tab; and 
     FIG. 5 is a side elevational view of another alternate embodiment of a bar coded index tab. 
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     According to a preferred embodiment of the invention, a printed circuit board 10 is provided with a base 60 which holds a label 20, as shown in FIGS. 1 and 2. 
     A typical label 20 has machine-readable bar coded information 30 on a portion of the label and human-readable information 40 on another portion of the label. In this manner, the machine-readable information 30 can be read by drawing an optical scanning wand 50 across the surface of the label 20, as shown in FIG. 1. The other portion of the label, bearing human-readable information, is presented so as to be visible to the human eye without removing the p.c. board from its storage rack. 
     Base 60 affixes label 20 to printed circuit board 10 as shown in FIGS. 1 through 3. The base 60 has a front face 70. The front face 60 has a notch 80, as shown in FIGS. 1, 2, 4, and 5. As shown in FIG. 1, the notch 80 has a V-shaped cross-sectional profile. The notch 80 has an upper face 90 and a lower face 100, as shown in FIGS. 1 and 2. 
     Label 20 may include an adhesive backing (not shown) for affixing the label to notch 80 of base 60. Notch faces 90 and 100 allow adhesion of the label to their surfaces. The adhesive backing prevents shifting of label 20 within the notch 80 when the label is read by optical scanning wand 50. 
     After affixation of the label 20 to the notch, as shown in FIG. 2, machine-readable bar code information 30 runs along the upper face 90 of notch 80, and the human-readable information 40 runs along the lower face 100 of notch 80. In this manner, machine-readable information 30 is read from the upper face 90 of notch 80 while the human-readable information 40 is read from the lower face 100 of notch 80. FIG. 1 shows the machine-readable bar coded information 30 being read from label 20 along the upper face 90 of notch 80 by an optical scanning wand 50. 
     Lips 110A and 110B are provided along the outer edges of notch faces 90 and 100 where they intersect the front face 70 of the base 60. The edges of label 20 are retained under the lips 110A and 110B. 
     The lips 110A and 110B also provide a guide surface for optical scanning wand 50 as shown in FIG. 1, whereby the wand may be located against lip 110B, as shown in FIG. 1, and moved along the lip. This assures accurate reading of the bar code information without the necessity for human visual contact with the label, which would otherwise be necessary to verify alignment of the wand 50. By eliminating the need to visually align the optical scanning wand 50 with the machine-readable code information 30 of label 20, the work speed of an optical wand user may be increased. The user need only locate the wand against the leftmost portion of lip 110B and move wand 50 along lip 110B will he or she reaches the rightmost portion of the bar code information 30 of label 20. Such rapid wiping motions allow faster optical data input into an inventory data processing system. 
     Means are provided for attaching the base 60 to an object to be tagged such as a printed circuit board. FIGS. 1 and 3 show the use of a double-sided adhesive strip 120 to affix the base 60 to printed circuit board 10. 
     FIGS. 4 and 5 show alternate means for attaching the base 60 to an object, such as printed circuit board 10. FIG. 4 shows the use of a plurality of teeth 130A, 130B, and 130C, which allow easy insertion of p.c. board 10 into the base 50 but do not allow easy removal of the board from the base. In applications such as the printed circuit field, it is desirable that the teeth not score the surface of the p.c. boards to which they are affixed, in order to avoid damage to the board surfaces. Accordingly, the gap between teeth of opposing sides is spaced to provide gripping tension insufficient to score the printed circuit board. 
     FIG. 5 shows the use of dimple projections 140A, 140B, and 140C, to provide gripping tension on the object to which the bar coded tag is affixed, such as printed circuit board 10. It is desirable that the dimple projections not score the surface of the printed circuit board. Therefore, the gap between projections of opposing sides is spaced to provide gripping force sufficient to affix base 60 to p.c. board 10, but not sufficient to score the board surface. 
     Bar coded tag base 60 may also be affixed to objects by the use of pins or rivets (not shown) which are familiar to those skilled in the art of tag affixation.