Canon LC-7

Date of introduction:  January, 1979 Display technology:  LCD
New price:  $23.00 Display size:  8
Size:  2.1" x 3.4" x 0.10"  
Weight:  1.3 ounces Serial No:  
Batteries:  CR2016 Date of manufacture:  mth 03 year 1979
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  Toshiba T3867S
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Canon entered with the Palmtronic LC already in 1976 the market of LCD calculators and was about 6 month ahead the first Texas Instruments TI-1750

In the three years between the original Palmtronic LC-1 and this beautiful LC-7 we noticed some improvements in miniaturization:

Model Introduction Battery Thickness Weight PCB-Type
LC-1 1976 2*LR44 0.45" 2.4 ounces Rigid
LC-5 1977 CR2025 0.15" 1.7 ounces Thin rigid
LC-6 1978 CR2025 0.15" 1.1 ounces Thin rigid
LC-7 1979 CR2016 0.10" 1.3 ounces Flexible

This beautiful Palmtronic LC-7 gives once again easy access to the coin shaped battery through a front door.

LC-7_PCB.jpg (53455 Byte)The printed circuit board (PCB) of the Palmtronic LC-7 makes use of the Toshiba T3867S single-chip calculator circuit soldered onto a flexible printed circuit board.

About 4 years later credit card sized calculators used solar cells instead of the battery and were glued together to a thin sandwich. Find a typical product with the Canon LS-704.

Don't miss the Casio FIML CARD SL-800, a real credit card sized calculator with a thickness of only 0.030".

If you have additions to the above article please email:

Joerg Woerner, February 28, 2004. No reprints without written permission.