Light guide

A method comprising:

• receiving light passed through a hole in media into a light guide, with the media positioned between a plurality of independently operable light emitting devices and the light guide;
• directing the light from the plurality of light emitting devices in the light guide to a single light sensing device, wherein the single light sensing device comprises a single photocell or photoreceptor;
• and
• generating a signal indicative of the hole in the media using the light reaching the light sensing device,
• wherein receiving the light passed through the hole in the media includes simultaneously energizing the plurality of light emitting devices to detect a presence of the hole in the media, and after detecting the presence of the hole in the media, sequentially energizing individual ones of the plurality of light emitting devices to detect a location of the hole in the media.

An image forming system comprising:

• a hole detection apparatus comprising a plurality of independently operable light emitting devices, a light guide positioned to allow media to move between the light guide and the plurality of light emitting devices and configured to guide light from the plurality of light emitting devices, and a single light sensing device positioned to receive the light from the plurality of light emitting devices guided by the light guide and to generate a signal indicative of the light, wherein the single light sensing device comprises a single photocell or photoreceptor;
• an imaging unit for forming an image on the media;
• and
• a control unit in communication with the hole detection apparatus and the imaging unit, the control unit for receiving the signal generated by the hole detection apparatus and for preventing the formation of the image at a location of a hole in the media,
• wherein the control unit simultaneously energizes the plurality of light emitting devices to detect a presence of a hole in the media, and after detecting the presence of the hole in the media, sequentially energizes individual ones of the plurality of light emitting devices to detect a location of the hole in the media.

A computer-readable storage medium having computer-readable instructions for causing an image forming system to perform a method for de holes in print media in an image forming system, the method comprising:

• receiving light passed through a hole in media into a light guide, with the media positioned between a plurality of independently operable light emitting devices and the light guide;
• directing the light from the plurality of light emitting devices in the light guide to a single light sensing device;
• and
• generating a signal indicative of the hole in the media using the light reaching the light sensing devices,
• wherein receiving the light passed through the hole in the media includes simultaneously energizing the plurality of light emitting devices to detect a presence of the hole in the media, and after detecting the presence of the hole in the media, sequentially energizing individual ones of the plurality of light emitting devices to detect a location of the hole in the media.