| 摘要 |
PURPOSE:To provide an electronic desk-top calculator with a function of measuring the degree of fatigue by providing a fatigue-degree measurement key in addition to calculation input keys of the calculator and a control circuit that varies the flashing period of a light source while making the light source to flash with its key input. CONSTITUTION:On keyboard 1 of the electronic desk-top calculator, etc., fatigue- degree measurement key 1-1 is arranged in addition to information input keys and to control part 2, light source 4 such as LED is connected. With information input keys, arithmetic processing such as calculation is performed through control part 2 and the result is displayed on display part 4. With fatigue-degree measurement key 1-1, light source 2 is driven by control part 4 to flicker and the period of its flicker is varied according to a prescribed value to make it possible to measure the degree of fatigue from the variation curve between the flicker value and fatigue degree. |
