Patent ID: 9594460
Date: 2017-03-14
CPC Classifications: G06F

Claim:
1. A presentation system including: a projection device that projects a presentation image on a screen; and an optical signal output apparatus comprising: a switch having a first state or a second state, the switch being configured at a front edge of a housing of the optical signal output apparatus, the switch having the first state when the front edge of the optical signal output apparatus does not touch the screen, and the switch having the second state while the front edge touches the screen; and an optical signal output section that outputs two types of light including a low-level optical signal and a high-level optical signal, the low-level signal being output when the switch has the first state, and the high-level optical signal being output when the switch is at the second state, wherein at least the high-level optical signal is used in association with positional information of the presentation image, wherein the projecting device further comprises an optical signal processor that processes optical signals output by the optical signal output section of the optical signal output apparatus, the optical signal processor determining whether a high-level optical signal is output from the optical signal output apparatus or another remote control apparatus that is capable of outputting optical signals of the same wavelength band as the optical signal output apparatus, wherein, the presentation system has a calibration mode, in which the optical signal processor of the projecting device accumulates a plurality of the low-level optical signals and a plurality of the high-level optical signals and determines a threshold based on accumulated optical signals, wherein the presentation system has a normal mode, in which the optical signal processor uses the threshold obtained in the calibration mode to determine whether an optical signal output by the optical signal output section is a low-level optical signal or a high-level optical signal, wherein the presentation system uses a change of a signal level of the optical signal output by the optical signal output section to detect a click operation, wherein the click operation represents an operation of a display control, the display control including displaying a following presentation image.