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List Of CRT Video Projectors
This is an incomplete list of front-projection CRT video projectors. List of CRT projectors Re-badged projectors A number of projector manufacturers produced projectors that were sold under the brand of different makers, sometimes with minor electrical or cosmetic modification. The following list reflects these re-badged projectors. External links Curt Palme CRT Projector FAQs, Tips, Manuals References * https://web.archive.org/web/20061216172634/http://www.freebrd.com/69PG-Cross.html {{DEFAULTSORT:CRT video projectors Projectors Technology-related lists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CRT Video Projector
A CRT projector is a video projector that uses a small, high-brightness cathode-ray tube (CRT) as the image generating element. The image is then focused and enlarged onto a screen using a lens kept in front of the CRT face. The first color CRT projectors came out in the early 1950s. Most modern CRT projectors are color and have three separate CRTs (instead of a single, color CRT), and their own lenses to achieve color images. The red, green and blue portions of the incoming video signal are processed and sent to the respective CRTs whose images are focused by their lenses to achieve the overall picture on the screen. Various designs have made it to production, including the "direct" CRT-lens design, and the Schmidt CRT, which employed a phosphor screen that illuminates a perforated spherical mirror, all within an evacuated CRT. The image in the Sinclair Microvision flat CRT is viewed from the same side of the phosphor struck by the electron beam. The other side of the screen c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ANSI Lumen
The lumen (symbol: lm) is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs from power (radiant flux), which encompasses all electromagnetic waves emitted, including non-visible ones such as thermal radiation (infrared). By contrast, luminous flux is weighted according to a model (a "luminosity function") of the human eye's sensitivity to various wavelengths; this weighting is standardized by the CIE and ISO. The lumen is defined as equivalent to one candela-steradian (symbol cd·sr): : 1 lm = 1 cd·sr. A full sphere has a solid angle of 4π steradians (≈ 12.56637 sr), so an isotropic light source (that uniformly radiates in all directions) with a luminous intensity of one candela has a total luminous flux of :. One lux is one lumen per square metre. Explanation If a light source emits one candela of luminous intensity uniformly across a solid angle of one steradian, the total luminous flux emitt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Popular Science Monthly
Popular science (also called pop-science or popsci) is an interpretation of science intended for a general audience. While science journalism focuses on recent scientific developments, popular science is more broad ranging. It may be written by professional science journalists or by scientists themselves. It is presented in many forms, including books, film and television documentaries, magazine articles, and web pages. History Before the modern specialization and professionalization of science, there was often little distinction between "science" and "popular science", and works intended to share scientific knowledge with a general reader existed as far back as Greek and Roman antiquity. Without these popular works, much of the scientific knowledge of the era might have been lost. For example, none of the original works of the Greek astronomer Eudoxus (4th century BC) have survived, but his contributions were largely preserved due to the didactic poem ''Phenomena'' written ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Betamax
Betamax (also known as Beta, and stylized as the Greek letter Beta, β in its logo) is a discontinued consumer analog Videotape, video cassette recording format developed by Sony. It was one of the main competitors in the videotape format war against its primary rival, VHS. Betamax was introduced in Japan on May 10, 1975, and launched in the United States later that year. Betamax was widely regarded, in part due to Sony's marketing, as offering superior picture quality compared to VHS. Its initial β1 speed provided 250 horizontal lines of resolution, compared to VHS's 240 lines, but early Beta tapes were limited to 60 minutes of recording time, making them impractical for recording movies or sporting events. To address this, Sony introduced the β2 speed, which doubled recording time to two hours but reduced resolution, negating its technical advantage. VHS's commercial success over Betamax was also driven by JVC's strategy of licensing the format broadly, spurring competition ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sony HDVS
Sony HDVS (High-Definition Video System) is a range of high-definition video equipment developed in the 1980s to support the Japanese Hi-Vision standard which was an early analog high-definition television system (used in multiple sub-Nyquist sampling encoding (MUSE) broadcasts) thought to be the broadcast television systems that would be in use today. The line included professional video cameras, video monitors and linear video editing systems. History Sony first demonstrated a wideband analog video HDTV capable video camera, monitor and video tape recorder (VTR) in April 1981 at an international meeting of television engineers in Algiers, Algeria. The HDVS range was launched in April 1984, with the HDC-100 camera, which was the world's first commercially available HDTV camera and HDV-1000 video recorder, with its companion HDT-1000 processor/TBC, and HDS-1000 video switcher all working in the 1125-line component video format with interlaced video and a 5:3 aspect ratio. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell & Howell
Bell and Howell is a United States brand of cameras, lenses, and motion picture machinery. It was originally founded as a company in 1907, and headquartered in Wheeling, Illinois. The company was acquired by Böwe Systec in 2003. Since 2010, the brand name has been licensed for a variety of consumer electronics products. History According to its charter, the Bell & Howell Company was incorporated on February 17, 1907. It was recorded in the Cook County Record Book eight days later. The first meeting of stockholders took place in the office of Attorney W. G. Strong on February 19. The first board of directors was chosen for a term of one year: Donald Joseph Bell (1869–1934), chairman; Albert Summers Howell (1879–1951), secretary; and Marguerite V. Bell (wife of Donald Bell), vice chairman. The firm made products for the motion picture industry. The Bell & Howell 2709 was the first all metal, commercially available motion picture camera. The 2709 was so expensive that only ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harman Kardon
Harman/Kardon is a brand of US-based Harman International Industries. Harman Kardon was originally founded in Westbury, New York, in 1953 by business partners Sidney Harman and Bernard Kardon. The company is focused on three audio equipment business segmentsAutomotive, Consumer and Professionaloffering products under company-owned brand names including AKG, Bang & Olufsen Automotive, Becker, Crown International, dbx, DigiTech, JBL, JBL Professional, Infinity Systems, Harman/Kardon, Lexicon, Mark Levinson Audio Systems, Soundcraft and Studer. HARMAN International corporate customers include Apple, Audi, BMW, Cadillac, Ford, Genesis, Google, Hyundai, Kia, Lexus, Lincoln, Mercedes-Benz, Ram Trucks, Toyota and Volkswagen. As of June 30, 2007, the company held 1,885 trademark registrations and 294 pending trademark applications around the world. The company also held 1,695 United States and foreign patents and 2,172 pending patent applications covering various audio, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Line Doubler
A line doubler is a device or algorithm used to deinterlace video signals prior to display on a progressive scan display. Function The main function of a deinterlacer is to take an interlaced video frame which consists of 60 two-field interlaced fields of an NTSC analogue video signal or 50 fields of a PAL signal, and create a progressive scan output. Cathode ray tube (CRT) based displays (both direct-view and projection) are capable of directly displaying both interlaced and progressive video, and therefore the line-doubling process is an optional step to enhance picture quality. Other types of displays are fixed pixel displays, including LCD displays, plasma displays, DLP projectors, and OLED displays, which are not scanned from top left to bottom right corners and generally cannot accept an interlaced signal ''directly'', and so require some kind of deinterlacing. Often, this is built in to the display and transparent to the user. Progressive scan DVD players also feature ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glycol
A diol is a chemical compound containing two hydroxyl groups ( groups). An aliphatic diol may also be called a glycol. This pairing of functional groups is pervasive, and many subcategories have been identified. They are used as protecting groups of carbonyl groups, making them essential in synthesis of organic chemistry. The most common industrial diol is ethylene glycol. Examples of diols in which the hydroxyl functional groups are more widely separated include 1,4-butanediol and propylene-1,3-diol, or beta propylene glycol, . Synthesis of classes of diols Geminal diols A geminal diol has two hydroxyl groups bonded to the same atom. These species arise by hydration of the carbonyl compounds. The hydration is usually unfavorable, but a notable exception is formaldehyde which, in water, exists in equilibrium with methanediol H2C(OH)2. Another example is (F3C)2C(OH)2, the hydrated form of hexafluoroacetone. Many gem-diols undergo further condensation to give dimer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Projectors
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display, or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen. The most common type of projector used today is called a video projector. Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, but old analog projectors are still used at some places. The newest types of projectors are handheld projectors that use lasers or LEDs to project images. Movie theaters used a type of projector calle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
