| 摘要 |
PURPOSE:To simultaneously display a time on a screen to be enlarged and projected by providing a time display unit using a liquid crystal underneath an upper glass plate of an overhead projector (OHP). CONSTITUTION:A liquid crystal time display unit 6 connected to a timer 1 is contained underneath an upper surface glass plate 5 of a transmission type OHP 3 used by a lecturer 4. A time displayed on the unit 6 is enlarged and projected together with a projecting image 9 to a screen 7. A residual time 10 of a lecture is projected to a lower part of the image 9 to display residual 5 min. An operation unit 11 of the OHP 3 has a power switch, a zoom switch, a brightness changeover switch, buzzer, etc. Such a timer 1 is connected to the OHP 3 to always project a residual time during giving a lecture. Accordingly, the lecturer 4 can always observe the residual time. When an emcee, etc., operates the timer 1 to set a predetermined time, a lecture time can be automatically managed. |
