Light pen - Revision history

Jnc: +cat

2018-12-13T15:18:57Z

+cat

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			[[Category: Device Basics‎‎]]

Jnc: Proper cat

2018-10-19T22:54:03Z

Proper cat

← Older revision		Revision as of 22:54, 19 October 2018
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	It was invented on the [[Whirlwind]] computer when early experience with a [[joystick]] showed that it was slow and difficult to zero in on a selected item.		It was invented on the [[Whirlwind]] computer when early experience with a [[joystick]] showed that it was slow and difficult to zero in on a selected item.

	The initial implementation was simply a light-~~senstive~~ sensor, a phototube, connected to the computer; it was held up to the [[cathode ray tube\|CRT]] [[display]]. When the beam illuminated the spot on the screen in front of the light gun, it produced a pulse from the sensor, which the computer could detect, and correlate with the location of the beam.		The initial implementation was simply a light-sensitive sensor, a phototube, connected to the computer; it was held up to the [[cathode ray tube\|CRT]] [[display]]. When the beam illuminated the spot on the screen in front of the light gun, it produced a pulse from the sensor, which the computer could detect, and correlate with the current location of the beam.

	Later implementations used a smaller sensor in a pen-sized housing, hence the later name.		Later implementations used a smaller sensor in a pen-sized housing, hence the later name.

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Jnc: typo

2018-09-15T17:45:27Z

typo

← Older revision		Revision as of 17:45, 15 September 2018
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	The '''light pen''' (called the '''light gun''' in its initial implementation) is an early pointing device used with a [[graphical user interface]].		The '''light pen''' (called the '''light gun''' in its initial implementation) was an early pointing device used with a [[graphical user interface]].

	It was invented on the [[Whirlwind]] computer when early experience with a [[joystick]] showed that it was slow and difficult to zero in on a selected item.		It was invented on the [[Whirlwind]] computer when early experience with a [[joystick]] showed that it was slow and difficult to zero in on a selected item.

	The initial implementation was simply a light-senstive sensor, a phototube, connected to the computer; it was held up to the [[cathode ray ~~tub~~\|CRT]] [[display]]. When the beam illuminated the spot on the screen in front of the light gun, it produced a pulse from the sensor, which the computer could detect, and correlate with the location of the beam.		The initial implementation was simply a light-senstive sensor, a phototube, connected to the computer; it was held up to the [[cathode ray tube\|CRT]] [[display]]. When the beam illuminated the spot on the screen in front of the light gun, it produced a pulse from the sensor, which the computer could detect, and correlate with the location of the beam.

	Later implementations used a smaller sensor in a pen-sized housing, hence the later name.		Later implementations used a smaller sensor in a pen-sized housing, hence the later name.

	{{stub}}		{{stub}}

Jnc: Stubby, but an OK start

2018-09-15T16:23:03Z

Stubby, but an OK start

New page

The '''light pen''' (called the '''light gun''' in its initial implementation) is an early pointing device used with a [[graphical user interface]].

It was invented on the [[Whirlwind]] computer when early experience with a [[joystick]] showed that it was slow and difficult to zero in on a selected item.

The initial implementation was simply a light-senstive sensor, a phototube, connected to the computer; it was held up to the [[cathode ray tub|CRT]] [[display]]. When the beam illuminated the spot on the screen in front of the light gun, it produced a pulse from the sensor, which the computer could detect, and correlate with the location of the beam.

Later implementations used a smaller sensor in a pen-sized housing, hence the later name.

{{stub}}