CN208969337U - A kind of optical system changing the off-axis rate of picture - Google Patents

Abstract

The utility model provides a kind of optical system for changing the off-axis rate of picture characterized by comprising optical modulator, the optical modulator are the image source of the optical system；Camera lens, the camera lens be the optical system image device, object space can areas imaging be as circle；Wherein, the optical modulator and the picture circle have lap, the actually active region of optical modulator is less than the lap, the effective coverage is the region that optical modulator carries out dynamic modulation at work, change the center of the effective coverage and the centre distance of the picture circle, to change the off-axis rate of picture.It according to optical system provided by the utility model, can achieve the purpose that the off-axis rate of change picture of low cost, while promote the illumination of picture.

Description

A kind of optical system changing the off-axis rate of picture

Technical field

The utility model relates to a kind of projection arts, and in particular, to a kind of light for changing the off-axis rate of projected picture System.

Background technique

Microdisplay optical engine is widely used in the fields such as teaching, government bodies, enterprise, family, movie theatre.With the epoch Developing display effect of the people to micro display projector, more stringent requirements are proposed: brightness is higher, color is more gorgeous, can more show The slight level of mirror image.Microdisplay optical engine is using display panel as optical modulation device, the also picture as entire optical projection system Source is imaged by optical projection system and is received on screen by the illumination of lighting system.In micro-display light engine field of projection display, Especially in LCD, LCOS, DLP light engine field of projection display, LCD, LCOS Panel act on lower liquid crystal using different voltages The percent of pass of the rotational angle difference control light of molecule, but when it cannot be complete normal incidence/oblique incident ray as light valve Turn off, influence picture contrast, DMD chip is made of several micro-reflectors, and the switch state by controlling micro-reflector controls Light passes through, although the optical modulator of this type can turn off all incident lights, improves the contrast of image, figure The uniformity of picture can not improve simultaneously.

For the projector of existing microdisplay optical engine composition, high definition output has been generally required.But what it was faced Problem includes: that the size of the optical modulator of the high definition of 1. existing productions is all bigger, and length-width ratio is 16:10,16:9, without it The lesser optical modulator of his length-width ratio.High definition is all not achieved in the optical modulator that current existing length-width ratio is 4:3, resolution ratio It is required that.However, in actual use, all the picture of small length-width ratio is exported using the machine of high definition, wherein will not need to make Part just directly handles display black by video, i.e., so that the outer portion of optical modulator effective coverage is in a kind of always The state of pass is arranged so that the light of the corresponding lighting system in part of video processing black cannot export, will waste part The energy of light source；2. camera lens, under the limitation as circle, the off-axis amount of optical modulator cannot surpass the increase of design limitation, if increased Add, need to redesign camera lens, promotes cost.And it in the projector of ultrashort coke, camera lens therein is limited to design and make Ability is made, the requirement of redesign is often unable to satisfy, the off-axis amount of optical modulator can not be increased.

Therefore, it is necessary to a kind of optical system for changing the off-axis rate of picture be proposed, to solve the above problems.

Utility model content

A series of concept of reduced forms is introduced in utility model content part, this will be in specific embodiment part Middle further description.The utility model content part of the utility model is not meant to attempt to limit claimed Technical solution key feature and essential features, do not mean that the guarantor for attempting to determine technical solution claimed more Protect range.

The utility model provides a kind of optical system for changing the off-axis rate of picture, comprising: optical modulator, the optical modulator For the image source of the optical system；Camera lens, the camera lens are the image device of the optical system, and model is imaged in object space It encloses for as circle；Wherein, the optical modulator and the picture circle have lap, and the actually active region of optical modulator is less than institute Lap is stated, the effective coverage is the region that optical modulator carries out dynamic modulation at work, changes the effective coverage Center and it is described as circle centre distance, to change the off-axis rate of picture.

Selectively, the effective coverage can be rectangle, square or round.

Selectively, further includes: image planes, the image planes are the imaging surface of the optical system.

Selectively, the change of the off-axis rate of the optical modulator changes the off-axis rate of picture also Become, the off-axis rate refers to the center of the effective coverage to the height one of the distance as round center and the effective coverage Half ratio.

Selectively, the optical system is suitable for the high definition that aspect ratio of the picture is less than optical modulator physical picture element length-width ratio Projection.

Selectively, the optical modulator is LCD, LCOS or DLP.

Selectively, further includes: lighting system, the lighting system are light path system, realize light source to the light tune The Uniform Illumination of device processed.

Selectively, the lighting system includes photoconductive tube and/or fly's-eye lens, the photoconductive tube and/or fly's-eye lens Guidance light is incident to the optical modulator.

Selectively, it is realized on the optical modulator by changing the size of photoconductive tube bore or fly's-eye lens lens unit The size of illumination region and the size of the effective coverage match, to reach maximum light output.

More specifically, the utility model is suitable for short distance projector, such as the camera lens comprising projection than < 0.6, and The optical modulator of high definition is used simultaneously.To achieve the purpose that the off-axis rate of change picture of low cost, and at the same time promoting picture Illumination.

Detailed description of the invention

The utility model embodiment is described in more detail in conjunction with the accompanying drawings, the utility model above-mentioned and its Its purpose, feature and advantage will be apparent.Attached drawing is used to provide to further understand the utility model embodiment, and And part of specification is constituted, it is used to explain the utility model together with the utility model embodiment, not constitute to this reality With novel limitation.In the accompanying drawings, identical reference label typically represents same parts or step.

In attached drawing:

Fig. 1 is the schematic diagram of prior art projection system architecture；

Fig. 2 is the round schematic diagram with optical modulator positional structure of prior art picture；

Fig. 3 is in the utility model embodiment as the round schematic diagram with optical modulator positional structure；

Fig. 4 is in the utility model embodiment as the round schematic diagram with optical modulator positional structure.

Description of symbols

100 ray machines

1 optical modulator chip

2 lens

3 projected pictures

4 screens

10 as round size

The size of 20 optical modulators

30 as the round center of circle

The effective coverage of 40 optical modulators

50 display sidelines

H optical modulator effective coverage center is to the distance as circle center, i.e. optical modulator effective district

The off-axis amount in domain

H projected picture center is to the distance of camera lens optical axis, the i.e. off-axis amount of picture

The magnifying power of M camera lens

Specific embodiment

In the following description, a large amount of concrete details are given more thoroughly to manage in order to provide to the utility model Solution.It is, however, obvious to a person skilled in the art that the utility model may not need it is one or more of these thin It saves and is carried out.In other examples, in order to avoid obscuring with the utility model, for more well known in the art Technical characteristic is not described.

In order to thoroughly understand the utility model, detailed step will be proposed in following description, it is practical to illustrate The light supply apparatus and lighting system of novel proposition.Obviously, the execution of the utility model is not limited to those skilled in the art The specific details being familiar with.The preferred embodiment of the utility model is described in detail as follows, however other than these detailed descriptions, this Utility model can also have other embodiments.

It should be understood that when the term " comprising " and/or " including " is used in this specification, indicating described in presence Feature, entirety, step, operation, element and/or component, but do not preclude the presence or addition of other one or more features, entirety, Step, operation, element, component and/or their combination.

The common structure of projector is as shown in Figure 1, the projector includes lighting system (not shown) at present, and in light The optical modulator that road is set gradually, such as optical modulator chip 1, lens 2 and projected picture 3, wherein optical modulator chip 1 Ray machine 10 is together constituted with lens 2, the lens 2 are arranged between optical modulator chip 1 and projected picture 3, and Projected picture 3 is located on screen 4, when similar scheme is projector design, (model can be imaged according to the picture circle size of camera lens Enclose) and the size of size of optical modulator chip determine the off-axis amount h of the maximum of optical modulator chip, so that the maximum for obtaining picture is off-axis H is measured, wherein H=M*h, M is the magnifying power of lens.

As circle is as shown in Figure 2 with the positional relationship of optical modulator, wherein 10 be the size as circle, and 20 be optical modulator Size, 30 be the center of circle as circle, and h is the off-axis amount of optical modulator.

According to Fig. 1 and projector illustrated in fig. 2, it may be seen that being essentially consisted in the shortcomings that current projector:

1. the size of the optical modulator of the high definition of existing production is all bigger, and length-width ratio is 16:10,16:9, without height Clear 4:3 or the lesser optical modulator of other length-width ratios.In actual use, all using the small of the machine output needs of high definition The picture of length-width ratio is not required to part to be used and just directly handles display black by video, wastes the energy of part light source；

2. camera lens is effective as under the limitation of circle, the amount off axis of optical modulator cannot surpass the increase of design limitation, if increased Add, need to redesign camera lens, promotes cost.The camera lens of ultrashort coke class is limited to design and manufacturing capacity, is unable to satisfy requirement.

To solve the above problems, the utility model provides a kind of projector, the projector includes providing a kind of change picture The optical system of the off-axis rate in face, comprising: optical modulator, the optical modulator are the image source of the optical system；Camera lens, the mirror Head be the optical system image device, object space can areas imaging be as circle；Wherein, the optical modulator with it is described There is lap as round, the actually active region of optical modulator is less than the lap, and the effective coverage is light modulation Device carries out the region of dynamic modulation at work, changes the center of the effective coverage and the centre distance of the picture circle, to change Become the off-axis rate of picture.Projector provided by the utility model can be realized following advantage: 1. light actually used according to picture The size of modulator improves off-axis amount h to greatest extent；2. modifying the size of photoconductive tube or compound eye, cooperate practical light modulation The size of device realizes the promotion of brightness.

The utility model is described in detail below with reference to Fig. 3, Fig. 4.

Wherein, as circle is as shown in Figure 3 with the positional relationship of optical modulator in the utility model embodiment, wherein 10 be picture Round size, 20 be the size of optical modulator, and 30 be the center of circle as circle, and 40 be the effective coverage of optical modulator, and h is optical modulator Effective coverage center to the distance as circle center, the i.e. off-axis amount of optical modulator, dash area be optical modulator effective coverage it Outer part.So-called off-axis rate refers to the center of the effective coverage to the distance at the center of the picture circle in the utility model With the ratio of the mid-height of the effective coverage.

The size of picture circle 10 is determined that especially short-focus lens (projection is than < 0.6), especially ultrashort zoom lens (are thrown by camera lens Penetrate than < 0.3), the off-axis amount that can accomplish at present is about 0~0.2*S (height that S is optical modulator chip 1).

Projector's main component is light source, optical modulator, camera lens.The size of optical modulator is generally fixed several rulers Very little, by the brightness decision of light source, the clarity of machine determined by the resolution ratio of optical modulator with camera lens for the brightness of machine.Actually set Meter process is the general resolution ratio for first selecting optical modulator, then selects light source and camera lens.The optical modulator of the high definition of existing production Size it is all bigger, and length-width ratio be 16:10,16:9, the not 4:3 of high definition or the lesser light modulation of other length-width ratios Device.The utility model is by specific setting, illustratively, for example controls on software, so that high definition optical modulator is unused Turn off part.Dash area as shown in Figure 3, in this way, under the camera lens of onesize picture circle size, the off-axis amount of optical modulator H is improved, and then the off-axis amount of picture is also improved.Specifically, optical modulator is shown in Fig. 3 and as circular portion weight Folded, the long side of the optical modulator intersects with described as round, extends to form display sideline 50 along short side direction using intersection point as starting point, The outside in the display sideline 50 is the fringe region of the optical modulator, which is shown as dash area, the shade Partial size is determined by the length-width ratio of image to be displayed, selectively, which can be closed, is not used in image It has been shown that, therefore, entire optical modulator has been moving upward certain altitude, and therefore, the center of effective coverage is to described as in circle The distance of the heart and the ratio of the mid-height of the effective coverage also correspondingly improve, and then improve its off-axis rate, should be from The promotion of axial ratio promotes the off-axis rate of picture also, and the off-axis rate of picture makes optical system after being promoted System can be applied even more extensively.According to description above, the actually active region of above-mentioned optical modulator is less than the overlapping Part, the effective coverage are the region that optical modulator carries out dynamic modulation at work, change the center of the effective coverage With the centre distance as circle, to change the off-axis rate of picture, according to effective coverage center with as the positional relationship of circle center, The off-axis rate of available picture changes, and when fringe region is closed, the length-width ratio of light modulation is reduced, and can be used for opposite The high definition of small length-width ratio is shown.Selectively, the effective coverage can be rectangle, square or round.

Selectively, the center of effective coverage also can reduce at a distance from as round center, thus reduce picture from Axial ratio.

Off-axis amount h specifically raising amount is calculated according to Fig. 4, according to design requirement, the radius of camera lens picture circle is R, is selected High definition optical modulator original size be W*S, the screen size of actual use and the size of optical modulator be not corresponding, it is only necessary to The effective dimensions of W'*S, W' < W, then amount h can be promoted by structural modification off axis:

The promotion of off-axis amount h correspondingly obtains the promotion that image planes measure H off axis by the imaging of lens on the screen, To promote the off-axis rate of picture, and then meet the use of special occasions.

Become smaller accordingly, due to the size of high definition optical modulator, for same lighting system, for example, light source, irradiation In the range of the size reduction of light on an optical modulator to actual use.By adjusting optical path shaping element, such as photoconductive tube Or the size of fly's-eye lens, the output quantity of actual light source can be improved, promote source efficiency.Illustratively, photoconductive tube and multiple The size of eye can be adjusted according to the following formula, size * W'/W before size=adjustment adjusted.The light of light source output enters It is incident upon on optical modulator in lesser area size, so that its illumination rises, correspondingly, the illumination of the picture after projection is also obtained It is corresponding to be promoted, to improve source efficiency.

Therefore, the technical solution of the utility model may be implemented:

1. promoting the off-axis of picture to greatest extent to the greatest extent using size according to real screen under conditions of camera lens is limited Rate meets the use of special occasions.

2. being promoted using the picture illumination after this structural adjustment, light source utilization rate is improved compared to original.

Therefore, the utility model can achieve the purpose of the change off-axis rate of picture of low cost, while promote the photograph of picture Degree.

The utility model is illustrated through the foregoing embodiment, but it is to be understood that, above-described embodiment is Purpose for illustrating and illustrating, and be not intended to limit the invention within the scope of described embodiment.Furthermore ability Field technique personnel are it is understood that the utility model is not limited to above-described embodiment, and introduction according to the present utility model is also More kinds of variants and modifications can be made, these variants and modifications all fall within the utility model range claimed with It is interior.The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims (9)

1. a kind of optical system for changing the off-axis rate of picture characterized by comprising

Optical modulator, the optical modulator are the image source of the optical system；

Camera lens, the camera lens be the optical system image device, object space can areas imaging be as circle；

Wherein,

The optical modulator and the picture circle have lap, and the actually active region of optical modulator is less than the overlapping portion Point, the effective coverage is that optical modulator carries out the region of dynamic modulation at work, change the center of the effective coverage with The centre distance of the picture circle, to change the off-axis rate of picture.

2. optical system as described in claim 1, which is characterized in that the effective coverage can be rectangle, square or circle Shape.

3. optical system as described in claim 1, which is characterized in that further include: image planes, the image planes are the optical system Imaging surface.

4. optical system as described in claim 1, which is characterized in that the mirror is passed through in the change of the off-axis rate of optical modulator After head the off-axis rate of picture is also changed, the off-axis rate refers to the center to the center of the picture circle of the effective coverage The ratio of distance and the mid-height of the effective coverage.

5. optical system as described in claim 1, which is characterized in that the optical system is suitable for aspect ratio of the picture and is less than light The high definition of modulator physical picture element length-width ratio projects.

6. optical system as described in claim 1, which is characterized in that the optical modulator is LCD, LCOS or DLP.

7. optical system as claimed in any one of claims 1 to 6, which is characterized in that further include: lighting system, the illumination system System is light path system, realizes light source to the Uniform Illumination of the optical modulator.

8. optical system as claimed in claim 7, which is characterized in that the lighting system includes that photoconductive tube and/or compound eye are saturating Mirror, the photoconductive tube and/or fly's-eye lens guidance light are incident to the optical modulator.

9. optical system as claimed in claim 8, which is characterized in that by changing photoconductive tube bore or fly's-eye lens lens list The size of member realizes that the size of illumination region and the size of the effective coverage match on the optical modulator, to reach maximum Light output.