CN2465207Y - Lighting for projector - Google Patents

Lighting for projector Download PDF

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Publication number
CN2465207Y
CN2465207Y CN 01200897 CN01200897U CN2465207Y CN 2465207 Y CN2465207 Y CN 2465207Y CN 01200897 CN01200897 CN 01200897 CN 01200897 U CN01200897 U CN 01200897U CN 2465207 Y CN2465207 Y CN 2465207Y
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CN
China
Prior art keywords
light
lighting device
polar biased
projector
shadow shield
Prior art date
Application number
CN 01200897
Other languages
Chinese (zh)
Inventor
王志远
Original Assignee
台达电子工业股份有限公司
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Publication date
Application filed by 台达电子工业股份有限公司 filed Critical 台达电子工业股份有限公司
Priority to CN 01200897 priority Critical patent/CN2465207Y/en
Application granted granted Critical
Publication of CN2465207Y publication Critical patent/CN2465207Y/en

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Abstract

The utility model relates to a lighting device for a projector, which comprises a light source, a light gathering system for gathering light beams coming from the light source and a polarizing converter which is used for receiving the light beams gathered by the light gathering system and polarizing the light beams so that the polarized light beams shoots into a light splitting and combining system of a projector. The lighting device for a projector also comprises a light shielding plate arranged between the light gathering system and the polarizing converter, and the light shielding plate is alternately provided with a plurality of openings in regular arrangement and is used for shielding partial light beams entering the polarizing converter. The utility model can reduce the brightness of the light beams shooting into the light splitting and combining system, reduce stray light entering the light splitting and combining system and enhance the contrast effect of a projecting image of the projector.

Description

The lighting device of projector

The utility model relates to a kind of lighting device of projector, particularly a kind of lighting device with projector of particular optical shadow shield.

Projector has been one of indispensable instrument of an office, and now, very popular liquid crystal projector has also become the main flow of new-type projector.Existing projector mainly comprises illuminator, divides photosynthetic photosystem and projection system three parts.Illuminator comprises the light source of projector, with light source projects to the condenser system that divides photosynthetic photosystem, divide photosynthetic photosystem then the light beam of incident to be divided into multiple light according to the color of its light beam or polar biased state, at last, light beam is merged and be incident to projection system, projection system then projects image with the light beam of incident.

Generally speaking, the distribution of light that good light source is launched must be very even, that is its original beam must be a directional light as far as possible, can reduce the parasitic light that enters in the photosynthetic photosystem of branch so as far as possible.Because, these parasitic lights can have a strong impact on the colour purity and the contrast effect of the projection image of projection system, so for the image effect of existing projector, these can be said so from illuminator and the parasitic light that divides photosynthetic photosystem and determine the key of projector's projection quality of image.For liquid crystal projector, existing condenser system is to make the distribution of light homogenising, and the circular illumination distribution of original light source light beam is converted to the rectangular distribution of liquid crystal panel.Condenser system at present commonly used comprises the lens arra group, and it can form the light beam of light source the pointolite of array, and superimposedly exports it to branch photosynthetic photosystem, has even voltinism so that inject the light beam of the photosynthetic photosystem of branch.

The illuminator of liquid crystal projector is under the demand of high brightness, often need to use light sources such as high wattage bulb, this higher source luminance will produce very serious thermal effect in dividing photosynthetic photosystem, thereby, cause the wherein damage of optical element and liquid crystal panel easily, make optical element life-span and optical characteristics descend all thereupon.

As shown in Figure 1, in its lighting device for existing projector, cause the synoptic diagram of parasitic light from the wide-angle light beam of light source ejaculation, wherein, the lighting device of an available liquid crystal projector can comprise a light source 10, two lens arras 11 and 12 and polar biased converters (P-S converter) 13; Should existing projector comprise a photosynthetic photosystem 14 of branch in addition, the light beam of illuminator incides lens 141 of the photosynthetic photosystem 14 of branch.Wherein, in addition polarization of the light beam that polar biased converter 13 is exported lens arra group 11 and 12 for example, becomes input non-polarization light wherein into S attitude polarization light, and exports the photosynthetic photosystem of branch to.Because original light source 10 emitted light beams are not to be parallel beam fully, and, lens arra group 11 and 12 light beams of being exported also comprise the light component of wide-angle, then are formed into the parasitic light that is incident upon in the photosynthetic photosystem 14 of branch behind these light beams process polar biased converters 12.And, the light beam of incident polar biased converter 12 is because lens combination 11 focuses on also incomplete, the output beam that causes polar biased converter 12 is not to be S attitude polar biased light fully, and is this because incomplete non-S attitude that produces of polarization or P attitude polar biased light beam also can worsen owing to the increase of non-parallel light.Above-mentioned each spuious light beam through repeatedly reflection and transmission, forms the part of projection image at last in dividing photosynthetic photosystem 14, thereby greatly influences the colour purity and the contrast of projection image.

Fundamental purpose of the present utility model is to provide the lighting device of the projector of a kind of colour purity and good contrast.

For achieving the above object, the utility model is taked following technical measures:

The lighting device of projector of the present utility model comprises:

A light source;

A condenser system is in order to assemble the light beam from light source;

A polar biased converter in order to accepting the light beam that condenser system is assembled, and with its polarization, and makes the light beam of polarization be incident to the photosynthetic photosystem of branch of projector;

Also comprise a shadow shield that is arranged between condenser system and the polar biased converter, this shadow shield arranged spaced has several regularly arranged perforates.

The perforate of described shadow shield is several equidistant arrangements and measure-alike strip perforate.

Wherein, the perforate of described shadow shield is several equidistant arrangements and measure-alike rectangle opening.

Wherein, the perforate of described shadow shield can be several polygon perforates along the loop configurations of different radii.

Wherein, the width of each perforate of described shadow shield is more than or equal to 1/2nd of each spectroscopical interval of polar biased on the described polar biased converter.

Wherein, described condenser system comprises at least along two groups of lens arras of light path front and back configuration.

Wherein, the perforate configuration mode of described shadow shield depends on the lens configuration state of described lens arra.

Wherein, described polar biased converter comprises the spectroscopical combination of several polar biased and several quarter-wave plates that is configured in the light path.

Wherein, described each polar biased spectroscope is strip, and the adjacent flat polar biased spectroscope that is overlapped into makes up.

Wherein, described each quarter-wave plate difference arranged spaced is at the rear side of described polar biased spectroscope combination place light path.

Compared with prior art, the utlity model has following effect:

Because the utility model disposes a shadow shield between condenser system and polar biased converter, the shadow shield arranged spaced has several regularly arranged perforates, but the shadow shield shield portions enters the light beam of polar biased converter.Like this, can lower the beam brightness of injecting the photosynthetic photosystem of branch, and can reduce the amount of stray light that enters the photosynthetic photosystem of branch, and then increase the serviceable life and its optical characteristics of maintenance of element, can improve the contrast effect of projector's projection image.

Reaching embodiment in conjunction with the accompanying drawings is described in detail as follows architectural feature of the present utility model:

Brief Description Of Drawings:

Fig. 1: in the lighting device of existing projector, cause the synoptic diagram of parasitic light from the wide-angle light beam of light source ejaculation;

Fig. 2: among the embodiment of the present utility model, utilize shadow shield to block the synoptic diagram of wide-angle incident beam;

Fig. 3: among the embodiment of the present utility model, the synoptic diagram of shadow shield configuration relation in projector's lighting device;

Fig. 4 a: among first embodiment of the present utility model, be configured in the planimetric map of lens in projector's lighting device;

Fig. 4 b: among first embodiment of the present utility model, the lens among cooperation Fig. 4 a are disposed at the planimetric map of a shadow shield in projector's lighting device;

Fig. 4 c: among first embodiment of the present utility model, the planimetric map of another kind of shadow shield;

Fig. 5 a: among first embodiment of the present utility model, be configured in the planimetric map of the lens in projector's lighting device;

Fig. 5 b: among first embodiment of the present utility model, the lens among cooperation Fig. 4 a are disposed at the planimetric map of the shadow shield in projector's lighting device;

As shown in Figure 2, it is among the embodiment of the present utility model, utilizes shadow shield to block the synoptic diagram of wide-angle incident beam.The lighting device of projector of the present utility model can comprise a light source 20, lens arra 21 and 22 and polar biased converters 23.Wherein, light source 20 and lens arra 21 and 22 form the condenser system of these illuminators, light source 20 emitted light beams are imaged on before the lens arra 22 through lens arra 21, transmission lens array 22 and reach the result of homogenising again, then, reenter and penetrate polar biased converter 23, after the polar biased conversion through polar biased converter 23, and inject the photosynthetic photosystem 24 of branch of projector.This illuminator is characterised in that: dispose a shadow shield 25 between condenser system and the polar biased converter 23, promptly shown in Fig. 4 b, shadow shield 25 is provided with the equidimension perforate 251 of several strips and equidistant configuration, like this, light beam is before incident polar biased converter 23, can be hidden by shadow shield 25 earlier and go the part luminous energy, reduce the beam brightness and the purpose that reduces parasitic light that incident divides photosynthetic photosystem 24 so can reach.Promptly as shown in Figure 2, the incomplete wide-angle light beam that forms of focusing owing to lens arra group 21 and 22, before injecting the photosynthetic photosystem 24 of branch, be subjected to blocking of shadow shield 25 earlier, so can significantly reduce the spuious light beam of the lens 241 that are incident in the photosynthetic photosystem 24 of branch.

Except above-mentioned effect,, can improve the polar biased optical purity that polar biased converter 23 is exported greatly because shadow shield 25 can shelter from spuious light beam earlier before polar biased converter 23.As shown in Figure 3, polar biased converter 23 comprises that several polar biased spectroscopes that are superimposed 231 and several arranged spaced are in the quarter-wave plate 232 of each polar biased spectroscope 231, wherein, 231 in the spectroscope of each strip is overlapped into a flat polar biased spectroscope combination, and 232 arranged spaced of each quarter-wave plate are in the back side of this tabular polar biased spectroscope combination.Utilize this configuration, the non-polarization light of incident polar biased converter 23 can be converted to S attitude polar biased light, reenter and be mapped to the photosynthetic photosystem 24 of branch, because most of parasitic light was sheltered from by shadow shield 25 before through polar biased converter 23 all, so, the light beam of most of incident polar biased converter 23 is neither excessive as for incident angle, so can significantly reduce because the incomplete light component of the polarization that light leak caused of polar biased converter 23.

In addition, the configuration mode of each lens unit in the configuration mode fits best lens arra 21 and 22 of each perforate on the shadow shield 25.Shown in Fig. 4 a and 4b, because lens arra 22 is separated into the rectangular lens unit 221 of several equidimensions, so preferably several strip perforates 251 equidistant and equidimension of the perforate of shadow shield 25 configuration.

Shown in Fig. 3 and 4b, block wide-angle light beam and the purpose that suitably reduces incident light brightness for reaching effectively, the width 252 of the perforate 251 on the shadow shield 25 more preferably greater than or equal each polar biased spectroscope 231 on the polar biased converter 23 interval 233 1/2, and, low excessively for the beam brightness that is unlikely to make incident divide photosynthetic photosystem 24, the optimum value of width 252 can be 1/2 of interval 233.

Shown in Fig. 4 c, except above-mentioned shadow shield 25 with strip perforate 251, also can change shadow shield 27, because it is to carry out blocking of incident beam with the perforate configuration of two dimension, so can more effectively reach the purpose that shadow shield 27 is set to be provided with reticulated, open 271.And 272 of vertical width of reticulated, open 271 possess identical condition with the width 252 of above-mentioned strip perforate 251.

Shown in Fig. 5 a and 5b, it represents another embodiment of the present utility model, the lens arra 26 of projector's lighting device is polygonal loop configurations, similarly, cooperates the shadow shield 28 of this kind lens arra also to dispose along the perforate 281 of the ring shooting of different radii.

As known from the above, preferably the arrange in pairs or groups configuration mode of lens arra in projector's lighting device of shadow shield provided by the utility model, that is, different lens unit configuration modes is the perforate configuration mode with respect to different shadow shields in the lens arra, like this, just can reach the purpose of blocking parasitic light effectively.So shadow shield of the present utility model does not limit its specific perforate configuration, its profile must depend on employed lens arra in projector's lighting device.

Foregoing is to utilize embodiment that technical characterictic of the present utility model is described, is not to be used to limit protection domain of the present utility model, even there is the people to change slightly on the basis of the utility model design, must belong in the protection domain of the present utility model.

Claims (10)

1, a kind of lighting device of projector comprises:
A light source;
A condenser system is in order to assemble the light beam from light source;
A polar biased converter in order to accepting the light beam that condenser system is assembled, and with its polarization, and makes the light beam of polarization be incident to the photosynthetic photosystem of branch of projector;
It is characterized in that:
Also comprise a shadow shield that is arranged between condenser system and the polar biased converter, this shadow shield arranged spaced has several regularly arranged perforates.
2, the lighting device of projector according to claim 1 is characterized in that, the perforate of described shadow shield is several equidistant arrangements and measure-alike strip perforate.
3, the lighting device of projector according to claim 1 is characterized in that, the perforate of described shadow shield is several equidistant arrangements and measure-alike rectangle opening.
4, the lighting device of projector according to claim 1 is characterized in that, the perforate of described shadow shield is several polygon perforates along the loop configurations of different radii.
5, the lighting device of projector according to claim 1 is characterized in that, the width of each perforate of described shadow shield is more than or equal to 1/2nd of each spectroscopical interval of polar biased on the described polar biased converter.
6, the lighting device of projector according to claim 1 is characterized in that, described condenser system comprises at least along two groups of lens arras of light path front and back configuration.
7, the lighting device of projector according to claim 6 is characterized in that, the perforate configuration mode of described shadow shield depends on the lens configuration state of described lens arra.
8, the lighting device of projector according to claim 1 is characterized in that, described polar biased converter comprises the spectroscopical combination of several polar biased and several quarter-wave plates that is configured in the light path.
9, the lighting device of projector according to claim 8 is characterized in that, described each polar biased spectroscope is strip, and the adjacent flat polar biased spectroscope that is overlapped into makes up.
10, the lighting device of projector according to claim 8 is characterized in that, described each quarter-wave plate difference arranged spaced is at the rear side of described polar biased spectroscope combination place light path.
CN 01200897 2001-02-21 2001-02-21 Lighting for projector CN2465207Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 01200897 CN2465207Y (en) 2001-02-21 2001-02-21 Lighting for projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 01200897 CN2465207Y (en) 2001-02-21 2001-02-21 Lighting for projector

Publications (1)

Publication Number Publication Date
CN2465207Y true CN2465207Y (en) 2001-12-12

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103293843A (en) * 2012-02-22 2013-09-11 台达电子工业股份有限公司 Polarization conversion component set for projector and projector
TWI483000B (en) * 2012-02-22 2015-05-01 Delta Electronics Inc Polarization converter and projector apparatus comprising the same
US9057881B2 (en) 2012-04-17 2015-06-16 Delta Electronics, Inc. Illumination system for a projection apparatus and projection apparatus
US9122068B2 (en) 2012-02-22 2015-09-01 Delta Electronics, Inc. Polarization converting element group for projection apparatus and projection apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103293843A (en) * 2012-02-22 2013-09-11 台达电子工业股份有限公司 Polarization conversion component set for projector and projector
TWI483000B (en) * 2012-02-22 2015-05-01 Delta Electronics Inc Polarization converter and projector apparatus comprising the same
CN103293843B (en) * 2012-02-22 2015-08-12 台达电子工业股份有限公司 For polarization conversion component group and the projection arrangement of projection arrangement
US9122068B2 (en) 2012-02-22 2015-09-01 Delta Electronics, Inc. Polarization converting element group for projection apparatus and projection apparatus
US9213225B2 (en) 2012-02-22 2015-12-15 Delta Electronics, Inc. Polarization converter for use in a projector apparatus and projector apparatus comprising the polarization converter
US9057881B2 (en) 2012-04-17 2015-06-16 Delta Electronics, Inc. Illumination system for a projection apparatus and projection apparatus

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