Toshiba TLP510U, TLP511E, TLP510E, TLP511U manual Optical System, Name Description

3. OPTICAL SYSTEM

3-1. Configuration

	No.	Name	Description
			Light source of the optical system. AC lighting system 120W, arc length 1.3 mm.
	1	UHP lamp	As the arc length is shorter than the conventional metal halide lamp, the light source
Lamp			operates as an ideal light point source and this improves the light convergence factor.
			Also, the color temperature gets higher and this allows to reproduce more natural
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			white color.
	2	Parabolic	Parabolic reflector converges light emitted from the UHP lamp forward in approximate
		reflector	parallel light beams and illuminates the liquid crystal panel.
	3	UV IR filter	Optical filter to pass necessary visible rays and cut unnecessary ultraviolet rays and
			infrared rays among light emitted from the UHP lamp.
	4	Multi-lenses	Two multi-lenses A and B allow a circular beam light emitted from the light source to
			illuminate the square liquid crystal panel evenly, thus providing projected pictures
		A, B
			with less brightness variation.
	5	Polarization	Separates the illuminating light from the light source into P polarization light and S
		light beam
			polarization light and leads both light to the multi-lens B with a little angle.
		splitter (PBS)
	6	Phase	Converts the polarization direction of incident light via the multi-lens B into another
		difference	direction. Here, P polarization light waveform separated by PBS is converted into
		plate	another S polarization light waveform.
	7	Condenser	Converges the illuminating light emitted from the light source into the liquid crystal
		lens	panel.
		Dichroic	Separates the white light emitted from the light source into RGB three primary colors.
	8		The white light emitted from the light source reflects B light using a dichroic mirror 1
		mirror	and the RG lights pass through the dichroic mirror 1. Of the RG lights passed, G light
Mirror			is reflected by the dichroic mirror 2 and R light passes.
box	9	Full reflection	Reflection mirror to lead the R and B lights separated by the dichroic mirrors 1 and 2
unit		mirror	to the liquid crystal panel.
	10	Field lens	Light transmitted through liquid crystal panel is converged in direction of focal point
			and effectively entered entrance pupil of the projection lens.
			In the R axis optical path which is longer than those of G, B, the relay lens works as
	11	Relay lens	a correction lens to arrange the illumination distribution of the liquid crystal panel
			surface with that of other liquid crystal panel.
			The illumination lights separated into RGB have the S polarizing waveform compo-
			nent in processing the PBS and phase difference plate operation previously de-
			scribed.
		Incident side	The incident side polarized plate arranges the illumination light more effective direct
			polarizing waveform. The phase difference plate used works to converge the S
	12	polarized	polarizing waveform into the P polarizing waveform which fits to the transparent axis
		plate/Phase	of the liquid crystal panel.
		difference	Since the phase difference plate possesses the wavelength characteristics for light,
		plate	each RGB axis employs exclusive phase difference plate. These polarizing plates
			and difference plates are constructed in one plate by attaching each other, and put
			on a glass plate.
			To increase the color purity ratio of three primary colors, the glass plate possess the
			dichroic filter characteristics for RG axis.
			Light exit side polarized plate is put on the light exit plane. When no signal voltage is
			applied, the polarization direction of transmission light rotates by 90 degrees. When a
			voltage is applied, the polarization direction is controlled owing to the voltage
		Liquid crystal	applied. That is, the liquid crystal panel employs such general TN type liquid crystal.
Prism	13		In this model, the incidence/exit polarization plate is placed (in normally white mode)
		panel	so that the light transmission amount becomes maximum (white) when no voltage is
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			added and the light transmission amount becomes minimum (black) when maximum
			voltage is added.
			According to the liquid crystal panel specification, exclusive panel for each RGB axis
			is employed and shown by identification seals.
	14	Cross prism	Works to mix RGB lights passed through the liquid crystal panel.
			Demodulated by the video signal on the liquid crystal panel and projects pictures
			displayed on the liquid crystal at a screen. Light axis of the projection lens is set at
Projec-		Projection	upper side of center of the liquid crystal panel and this realizes easy viewing of the
	15		panel because the projected screen position is upper than the unit position. The
tion
		lens	projected light shows S polarizing waveform and is compatible with the polarizing
lens
			screen.
			The projection lens employs the zoom & focus system and allows to project enlarging
			a picture upto maximum approx. 300 inch.

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