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electric eye wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 examples 2 see also 3 references 4 external links toggle the table of contents electric eye 4 languages العربية català français ikinyarwanda edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia device for detecting obstruction of a light beam for other uses see electric eye disambiguation electric eye for a garage door opener an electric eye is a photodetector used for detecting obstruction of a light beam an example is the door safety system used on garage door openers that use a light transmitter and receiver at the bottom of the door to prevent closing if there is any obstruction in the way that breaks the light beam the device does not provide an image only the presence of light is detectable visible light may be used but infrared radiation conceals the operation of the device and typically is used in modern systems originally systems used lamps powered by direct current or the power line alternating current frequency but modern photodetector systems use an infrared light emitting diode modulated at a few kilohertz which allows the detector to reject stray light and improves the range sensitivity and security of the device examples edit highway vehicle counter in the 1930s an electric eye vehicle counter was introduced in the us using two ir lamps set apart so that only cars and pedestrians would be counted 1 first compact commercial unit a compact type of electric eye was offered in 1931 that was enclosed in a small steel case and much easier to install compared to older models 2 automatic wrapping machines in the 1930s an electric eye apparatus was developed to help a wrapping machine wrap 72 boxes a minute 3 automatic door opener in 1931 general electric tested the first automatic door openers now popular in hospitals they called their electric eye the magic eye 4 5 6 business alarm system in 1931 an electric eye that used invisible uv wavelength was offered to businesses in need of a 24 hour alarm system 7 a system of this type is demonstrated in the first scene of the 1932 film jewel robbery automatic cameras in 1936 dr albert einstein and dr gustav bucky received a patent for a design which applied the electric eye to a camera the camera was capable of automatically determining the proper aperture and exposure 8 see also edit photoelectric sensor machine vision references edit autos are counted by electric eye january 1937 popular science electric eye and relay set combined in cabinet march 1931 popular mechanics electric eye is robot guard for wrapping machine february 1931 popular mechanics door that opens itself is boon to waitresses february 1931 popular mechanics residential garage door pdf california mandates battery backup with all gdos experts cite problems with the legislation archived from the original pdf on 11 november 2020 retrieved 4 june 2025 garage door automatic opener repair uv ray electric eye alarm february 1931 einstein invents automatic camera science news vol 180 6 september 10 2011 p 32 external links edit look up electric eye in wiktionary the free dictionary latest way beams of light are put to work popular mechanics april 1931 retrieved from https en wikipedia org w index php title electric_eye oldid 1311136447 categories optical devices garage door openers hidden categories articles with short description short description is different from wikidata this page was last edited on 13 september 2025 at 16 38 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents electric eye 4 languages add topic