projector
Let an agent explain projectors, relay history, technologies, specifications and safety from optics, cinema history and product standards sources, describe the named devices and flag related aliases, and distinguish projectors from displays, cameras, rotoscopes and lighting fixtures.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain projectors, relay history, technologies, specifications and safety from optics, cinema history and product standards sources, describe the named devices and flag related aliases, and distinguish projectors from displays, cameras, rotoscopes and lighting fixtures.
An optical device that projects images or moving images onto a surface such as a screen, including historical devices such as the magic lantern and the praxinoscope, a 19th-century animation device invented by Charles-Emile Reynaud in 1877, film projectors, slide and overhead projectors, and modern multimedia projectors using LCD, DLP or LCoS technology with lamp, LED or laser light sources, including laser projectors and specialised dome systems such as the All Dome Laser Image Projector used in planetariums; the registry aliases also include gobos, stencils placed in lighting fixtures to project patterns, and the rotoscope, a device for tracing film frames for animation, which are related but distinct. Projector lamps can reach high temperatures, and looking directly into bright beams, especially laser projectors, should be avoided.
What it is for: Displaying images on surfaces.
It can be explain history and technologies; relay specifications; describe named devices; relay eye and heat safety.
Distinguishing features
Optical projection
Light source and imager
Scalable image size
Long history
What it looks like
Boxes with lenses and fans, ceiling-mounted units, cinema projectors or dome projection systems.
Physical character
praxinoscope: 1877 year - Charles-Emile Reynaud
brightness unit: ANSI lumens note
DLP technology: Texas Instruments, 1987 invention note
How it is recognised
Image projection device
Praxinoscope, gobo, multimedia projector, laser projector, All Dome Laser Image Projector, rotoscope
Displays emit light directly; cameras capture images; rotoscopes trace frames; lighting fixtures illuminate, sometimes with gobos
Related models
is a kind of - in registry terms
includes -
uses - in many models
is contrasted with -
In practice
Families and kinds
magic lanterns and early animation devices
film projectors
slide and overhead projectors
digital multimedia projectors
laser and dome projectors
Standards and regulation
IEC 62471-5 photobiological safety of projectors
Laser product safety IEC 60825-1
Energy and electrical safety rules
Failure modes and hazards
Eye exposure to bright beams
Hot lamps and overheating
Treating related devices as projectors
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.projector-artifact
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a projector is.
Definition.
Definition
Definition.
Definition
Definition.
- What is a projector, and how does it differ from displays, cameras, rotoscopes and lighting fixtures? definition
- Has someone looked into a bright laser beam and has vision problems, in which case seek prompt eye care? boundary
Devices
Named devices.
Devices
Devices.
- What are praxinoscopes, multimedia, laser and dome projectors, and what are gobos and rotoscopes? definition
- Which entry fits the specific device? action
Technology Technology.
Science.
Imagers
LCD, DLP and LCoS.
Imagers
Imagers.
- How do LCD, DLP and LCoS projectors form images? provenance
- Which references are standard? provenance
Specifications
Brightness and contrast.
Specifications
Specifications.
- How are brightness, contrast and throw ratio measured? measurement
- Which sources are cited? provenance
History History.
Sources.
Early devices
Early devices.
Early devices
Early devices.
- How did magic lanterns and the praxinoscope lead to cinema? provenance
- Which entry fits praxinoscope? action
Cinema
Film to digital cinema.
Cinema
Cinema.
- How did cinemas move from film to digital projection? provenance
- Which entry fits digital cinema? action
Context Safety and uses.
Regulation.
Safety
Eye safety.
Safety
Safety.
- What do photobiological and laser standards say about projector safety? provenance
- Which entry fits laser safety? action
Planetariums
Dome projection.
Planetariums
Planetariums.
- How do full-dome laser systems project in planetariums? provenance
- Is the information current? boundary
What the second pass must settle
- The registry aliases gobo and rotoscope should be moved to lighting and animation entries
- Should the praxinoscope be a separate entry?
- How should projector standards be linked?