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digital camera
A digital camera or digicam is a camera that encodes digital images and videos digitally and stores them for later reproduction.〔Farlex Inc: (definition of digital camera at the Free Dictionary ); retrieved 2013-09-07〕 Most cameras sold today are digital, and digital cameras are incorporated into many devices ranging from PDAs and mobile phones (called camera phones) to vehicles.
Digital and film cameras share an optical system, typically using a lens with a variable diaphragm to focus light onto an image pickup device.〔MakeUseOf: (How does a Digital Camera Work ); retrieved 2013-09-07〕 The diaphragm and shutter admit the correct amount of light to the imager, just as with film but the image pickup device is electronic rather than chemical. However, unlike film cameras, digital cameras can display images on a screen immediately after being recorded, and store and delete images from memory. Many digital cameras can also record moving videos with sound. Some digital cameras can crop and stitch pictures and perform other elementary image editing.
==History==
(詳細はEugene F. Lally of the Jet Propulsion Laboratory, who when he wasn't coming up with ways to create artificial gravity was thinking about how to use a mosaic photosensor to capture digital images. His 1961 idea was to take pictures of the planets and stars while travelling through space to give information about the astronauts' position. Unfortunately, as with Texas Instrument employee Willis Adcock's filmless camera (US patent 4,057,830) in 1972, the technology had yet to catch up with the concept.
Steven Sasson as an engineer at Eastman Kodak invented and built the first electronic camera using a charge-coupled device image sensor in 1975. Earlier ones used a camera tube; later ones digitized the signal. Early uses were mainly military and scientific; followed by medical and news applications. In the mid to late 1990s digital cameras became common among consumers. By the mid-2000s digital cameras had largely replaced film cameras, and higher-end cell phones had an integrated digital camera. By the beginning of the 2010s almost all smartphones had an integrated digital camera.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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