CN103631074A - Projector - Google Patents

Abstract

The invention relates to a projector. The projector comprises a lighting system and an imaging system. The lighting system comprises a light source module, an array lens, a collecting lens and a display panel. The light source module is used to generate light. The light is disperse uniformly by the array lens, and then collected by the collecting lens, and then the light is reflected by the display panel to obtain an image light, and then the image light is projected through the imaging system. The effective focal length of the collecting lens is roughly equal to a value obtained by multiplying the focal ratio of the lighting system by the thickness of the array lens.

Description

Projector

Technical field

The projector that the present invention is little relevant for a kind of volume, optical performance is good.

Background technology

There is including in the market the electronic product (such as mobile phone, camera, mobile computer etc.) of minitype projection machine.In order to be arranged on electronic product, so projector's volume has big or small restriction, the volume of projector is less, the electronic product that can arrange in pairs or groups the more, but reduced projection body is long-pending, what conventionally follow is to sacrifice its optical performance, how to reduce projector's volume and maintain again existing optical performance, become important problem simultaneously.

Summary of the invention

The technical problem to be solved in the present invention is, cannot take into account the defect of miniaturization and optical property for minitype projection machine of the prior art, and the projector that a kind of volume is little, optical performance is good is provided.

The present invention is that the technical scheme that its problem of solution adopts is, a kind of projector is provided, and by adjusting the effective focal length of condenser and the thickness of array lens, maintains the optical performance of projector, can reach the object that reduces projector's volume again simultaneously.

Projector of the present invention comprises illuminator and imaging system.Illuminator comprises light source module, array lens, condenser and display panel, wherein light source module produces light, through array lens and dispersed, then by condenser, is converged, through display panel reflection, obtain image light again, then by imaging system, image light is projected away.The coke ratio that wherein effective focal length of condenser equals illuminator is haply multiplied by the thickness of array lens.

Wherein, the effective focal length of condenser can be 8.25mm-19.2mm.

The present invention also provides a kind of projector, comprising:

Illuminator, comprise light source module, array lens, condenser and display panel, this light source module produces light, through this array lens and dispersed, then by this condenser, converged, through this display panel reflection, obtain image light again, wherein the effective focal length of this condenser is 8.25mm-19.2mm; And

Imaging system, projects away this image light.

Implement projector of the present invention, there is following beneficial effect: can reduce projector's volume and maintain again preferably optical performance simultaneously.

Accompanying drawing explanation

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly also coordinates accompanying drawing to elaborate.

Fig. 1 is the schematic diagram according to projector of the present invention.

Fig. 2 is for illustrating the design concept of projector of the present invention.

Embodiment

Refer to Fig. 1, Fig. 1 is the schematic diagram according to projector of the present invention.Projector 2 of the present invention comprises illuminator 22 and imaging system 21, is described below:

Illuminator 22 comprises light source module 221,221 ', a plurality of collimation lens 222, light source compositor 223, array lens 224, catoptron 225, condenser 226, polarization spectroscope 227 and display panel 228.Wherein, light source module comprises the first light source 221 (for example green LED LED) and secondary light source 221 ' (for example red light emitting diodes and blue LED), diverging light for generation of different colours, through collimation lens 222, become parallel beam, light source compositor 223 is arranged on the intersection path of parallel beam, directive array lens 224 after parallel beam is synthetic, array lens 224 comprises at least 3 * 5 spheres or aspheric small biconvex lens, for light is dispersed, through catoptron 225, reflexing to condenser 226 is converged, then be incident upon polarization spectroscope 227, polarization spectroscope is isolated the polarized light of specific direction and is projected to display panel 228 from light, by display panel 228, add image information and obtain image light again, enter afterwards imaging system 21.

Imaging system 21 comprises a plurality of eyeglasses, and the image light being produced by illuminator 22, after these eyeglasses, can be projected on screen (not shown).

The coke ratio (F/#) of the coke ratio of imaging system 21 (F/#) and illuminator 22 will mate, and the image light that illuminator 22 produces like this could all be imaged system 21 and utilize.

Coke ratio (F/#) in an optical system (or claiming aperture) can following formula represent:

F/#=EFL/D (1)

Wherein EFL is effective focal length (Effective Focus Length), and D is clear aperature (Diameter of Clear Aperture).

Refer to Fig. 2, Fig. 2 is for illustrating the design concept of projector of the present invention.As previously mentioned, in illuminator 22, light is projected to display panel 228 after array lens 224 and condenser 226, and as seen from Figure 2, clear aperature D equals the thickness of array lens 224, and therefore above-mentioned (1) formula can be rewritten as follows:

F/# _illuminator=EFL _condenser/ T _{array lens}

Or

EFL _condenser=F/# _illuminator* T _{array lens}(2)

EFL wherein _condenserrepresent the effective focal length of condenser 226, F/# _{illumination system}system represents the coke ratio of illuminator 22, T _{array is saturating}mirror represents the thickness of array lens 224.It should be noted that in equation (2), allow EFL _condenserthe error range of have+2mm.Therefore, the present invention also comprises the EFL that is positioned at this error range _{optically focused mirror}.

Therefore at known illumination system 22 coke ratio F/# _illuminatorand the thickness T of array lens 224 _{array lens}situation under, can utilize (2) formula to calculate the effective focal length EFL of condenser 226 _condenser.In a preferred embodiment of the invention, the coke ratio F/# of illuminator 22 _illuminatorbetween 1.5-2.4, and the thickness T of array lens 224 _{array is saturating}mirror, between 5.5mm-8mm, can calculate the effective focal length EFL of condenser 226 accordingly _condensermust be limited between 8.25mm-19.2mm.

Once calculate the effective focal length EFL of condenser 226 _condenser, can design and obtain the minitype projection machine of optical performance the best and volume minimum.

Although the present invention discloses as above with preferred embodiment; but it is not in order to limit the present invention, those skilled in the art person, without departing from the spirit and scope of the present invention; still can do a little change and retouching, so protection scope of the present invention is when being as the criterion depending on the claim person of defining.

Claims (11)

1.Yi Zhong projector, is characterized in that, comprising:

Illuminator, comprise light source module, array lens, condenser and display panel, this light source module produces light, through this array lens and dispersed, then by this condenser, converged, through the reflection of this display panel, obtain image light again, the coke ratio that wherein effective focal length of this condenser equals this illuminator is multiplied by the thickness of this array lens; And

Imaging system, projects away this image light.

2. projector as claimed in claim 1, is characterized in that, the effective focal length of this condenser is 8.25mm-19.2mm.

3. projector as claimed in claim 1, is characterized in that, this light source module comprises the first light source and secondary light source.

4. projector as claimed in claim 3, is characterized in that, this first light source comprises green LED, and this secondary light source comprises red light emitting diodes and blue LED.

5. projector as claimed in claim 3, is characterized in that, more comprises a plurality of collimation lenses, and the light that this first light source and this secondary light source are produced becomes parallel beam.

6. projector as claimed in claim 5, is characterized in that, more comprises light source compositor, after these parallel beams are synthesized, is incident upon this array lens.

7. projector as claimed in claim 6, is characterized in that, this light source compositor is arranged on the path of these parallel beam intersections.

8. projector as claimed in claim 1, is characterized in that, this array lens comprises 3 * 5 spheres or aspheric small biconvex lens.

9. projector as claimed in claim 1, is characterized in that, more comprises catoptron, and the light by this array lens is reflexed to this condenser.

10. projector as claimed in claim 1, is characterized in that, more comprises polarization spectroscope, receives the light through this condenser, then from this light, isolates the polarized light of specific direction and is projected to this display panel.

11.Yi Zhong projector, is characterized in that, comprising:

Illuminator, comprise light source module, array lens, condenser and display panel, this light source module produces light, through this array lens and dispersed, then by this condenser, converged, through this display panel reflection, obtain image light again, wherein the effective focal length of this condenser is 8.25mm-19.2mm; And

Imaging system, projects away this image light.

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