CN102798955A

CN102798955A - Lens of projector

Info

Publication number: CN102798955A
Application number: CN2011101352771A
Authority: CN
Inventors: 孙嘉鸿
Original assignee: Asia Optical Co Inc
Current assignee: Asia Optical Co Inc
Priority date: 2011-05-23
Filing date: 2011-05-23
Publication date: 2012-11-28
Anticipated expiration: 2031-05-23
Also published as: CN102798955B

Abstract

The invention relates to a lens of a projector, comprising at least three lenses and at least two spacer rings. The two spacer rings are used for spacing the three lenses at a first interval at a first working temperature and spacing the three lenses at a second interval at a second working temperature; and the three lenses form a first image plane in the first interval and form a second plane in the second interval, and the first image plane and the second image plane are arranged in the same imaging plane.

Description

Projector lens

Technical field

The present invention is relevant with projector, more detailed is meant a kind of projector lens.

Background technology

In recent years; Progress along with image science and technology; The people who utilizes projector to carry out bulletin, video signal, meeting or ornamental film gets more and more, and is people can be carried easily use in projector to the different occasions (like parlor, meeting room or classroom), and the volume of projector and weight are day by day light and handy; And when avoiding because of user's mobile projector machine; Eyeglass in the projector lens is because of being given a shock the situation generation that is shifted, and in projector lens, just is provided with the spaced ring that a plurality of use identical material process and is distributed between each eyeglass, uses eyeglass is fixed on the preset position.

Yet, projector in use, these spaced rings will receive the waste heat that projector's internal light source produces and expand gradually, will cause the inner eyeglass displacement of projector lens and move burnt phenomenon producing.In other words; After projector uses a period of time; Going up formed image in imaging surface (like screen, cloth curtain or wall) will be fuzzy gradually because of the eyeglass displacement gradually; Then must focus again more once just can obtain image clearly this moment, not only causes the convenience of projector not good, the mood in the time of more can having influence on people and use projector.

Summary of the invention

The technical matters that the present invention will solve is; To the projector of the prior art image defective that can thicken in use for some time; A kind of projector lens is provided, and after projector used a period of time, the image of its projection did not have fuzzy gradually phenomenon and produces.

The technical scheme that the present invention is adopted for its technical matters of solution is, a kind of projector lens is provided, and includes at least three eyeglasses and at least two spaced rings.Wherein, these two spaced rings make this prismatic glasses first group of spacing separately, and when second temperature, make this prismatic glasses second group of spacing separately in order to when first working temperature; And this prismatic glasses has first and has the second picture plane as the plane, when second group of spacing when first group of spacing, and this first is positioned on the same imaging surface as the plane as plane and this second.

In addition, the present invention more provides another projector lens, and it includes at least three eyeglasses and at least two spaced rings.Wherein, these two spaced rings lay respectively between first this eyeglass and this second this eyeglass and between second this eyeglass and this three these eyeglasses, and these two spaced rings are made with the material of different heat expansion coefficient.

Moreover the present invention more provides a projector lens again, and it includes lens barrel, at least three eyeglasses and at least two spaced rings.Wherein, these three eyeglasses are located in this lens barrel; These two spaced rings are located in this lens barrel, and lay respectively between first this eyeglass and this second this eyeglass and between second this eyeglass and this three these eyeglasses; Again, these two spaced rings at least wherein one to process with the material of this lens barrel different heat expansion coefficient.

The projector lens of embodiment of the present invention has following beneficial effect: this projector lens receives heated light sources after heating a period of time, does not have to move burnt phenomenon generation.

Description of drawings

Fig. 1 is the arrangement plan of projector lens of the present invention.

Fig. 2 is the out of focus modulation transfer function figure of the present invention under first working temperature.

Fig. 3 is the out of focus modulation transfer function figure of the present invention under second working temperature.

Embodiment

For being illustrated more clearly in the present invention, lift now that preferred embodiment and conjunction with figs. specify as after.

See also Fig. 1, the projector lens 1 of preferred embodiment of the present invention includes lens barrel 10, five eyeglasses 21～25 and four spaced rings 31～34.These five eyeglasses 21～25 are located in this lens barrel 10, and divide into first eyeglass 21, second eyeglass 22, prismatic glasses 23, the 4th eyeglass 24 and the 5th eyeglass 25 in regular turn.The 4th spaced ring 31～34 is respectively first spaced ring 31, second spaced ring 32, the 3rd spaced ring 33 and the 4th spaced ring 34, and wherein, this first spaced ring 31 is between this first eyeglass 21 and this second eyeglass 22; This second spaced ring 32 is between this second eyeglass 22 and this prismatic glasses 23; The 3rd spaced ring 33 is between this prismatic glasses 23 and the 4th eyeglass 24; 34 of the 4th spaced rings are between the 4th eyeglass 24 and the 5th eyeglass 25.

Move burnt phenomenon generation for making this projector lens 1 receive heated light sources (figure does not show) after heating a period of time, not having, the spaced ring 31～34 of projector lens 1 of the present invention satisfies following condition when design:

1. at least wherein both of these spaced rings 31～34 are made with the material of different heat expansion coefficient;

2. these spaced rings 31～34 selecting for use to process and form at least wherein with the material of this lens barrel 10 different heat expansion coefficients;

By this; Utilize above-mentioned design conditions; Make under first working temperature of these spaced rings 31～34 when initial, make these eyeglasses 21～25 first group of spacing separately, and these eyeglasses 21～25 have the first picture plane when first group of spacing; And this first is positioned on the imaging surface (like cloth curtain, wall) as the plane, to form image clearly.

These spaced rings 31～34 are after hot a period of time; Its temperature will be promoted to second working temperature; These spaced rings 31～34 will make these eyeglasses 21～25 second group of spacing separately because of expanded by heating, and these eyeglasses 21～25 have the second picture plane when this second group of spacing, and this second is positioned on the above-mentioned imaging surface as the plane equally; Use making projector after use a period of time, the image that is incident upon this imaging surface is still clear.

Help reaching above-mentioned purpose, below spendable material and result of use thereof be described now:

In present embodiment, this first working temperature is 20 ℃, and this second working temperature is 85 ℃.It is that 0.105 nickel steel alloy (claiming invar alloy, constant steel again) is made that this lens barrel 10 is selected thermal linear expansion coefficient for use.It is that 0.105 nickel steel alloy is made that this first spaced ring 31 is selected thermal linear expansion coefficient equally for use.It is that 0.167 copper material is made that this second spaced ring 32 is selected thermal linear expansion coefficient for use.It is that 0.167 copper material is made that the 3rd spaced ring 33 is selected thermal linear expansion coefficient equally for use.34 of the 4th spaced rings are that to select thermal linear expansion coefficient for use be that 0.207 aluminum material is made.

Thickness and the amounts of thickness variation of these above-mentioned spaced rings 31～34 under this first working temperature and second working temperature is shown in following table one:

Table one

In addition, this lens barrel 10 is divided into A, B measures for two sections, and the A section of this lens barrel 10 and the B section length variations amount between this first working temperature and this second working temperature is shown in table two:

Table two

By this, can know, utilize the design of above-mentioned material to make on the image quality of this projector lens 1 when this first working temperature and this second working temperature and also can reach requirement from Fig. 2 to Fig. 3.Shown in Figure 2, be the out of focus modulation transfer function figure (Through Focus MTF) of projector lens 1 under first working temperature of present embodiment; Shown in Figure 3, be the out of focus modulation transfer function figure of projector lens 1 under second working temperature of present embodiment.

Can find out by Fig. 2 and Fig. 3; This projector lens 1 is compared with out of focus modulation transfer function figure under first working temperature at the out of focus modulation transfer function figure under second working temperature; Though this projector lens 1 produces a little forward migration as the plane under second working temperature, because of side-play amount small, so; Second as the plane still can with first keep as the plane and to be positioned on this imaging surface, and make the image that is incident upon on this imaging surface still keep clear.

Must be noted that; Be maintained in picture clearly the purpose except that the spaced ring that utilizes above-mentioned multiple unlike material 31～34 reaches, the spaced ring that also can see through the same coefficient of thermal expansion material cooperates the mode of the lens barrel of going up the different heat expansion coefficient material reach identical effect; In addition, the also not above-described material of the spendable material of the present invention is exceeded, and reaches the adjustment DBL so long as see through the material of different heat expansion coefficient, and makes imaging keep clear person, also belongs to the other enforcement aspect of the present invention.

The above is merely the preferable possible embodiments of the present invention, uses equivalent structure and method for making variation that instructions of the present invention and claim are done such as, ought to be included in the claim of the present invention.

Claims

1. a projector lens is characterized in that, comprises:

At least three eyeglasses;

At least two spaced rings in order to when first working temperature, make this prismatic glasses first group of spacing separately, and when second temperature, make this prismatic glasses second group of spacing separately;

In addition, this prismatic glasses forms the first picture plane, when second group of spacing, forms the second picture plane when first group of spacing, and this first is positioned on the same imaging surface as the plane as plane and this second.

2. projector lens as claimed in claim 1 is characterized in that, these two spaced rings are made with the material of different heat expansion coefficient respectively.

3. projector lens as claimed in claim 1 is characterized in that, more includes lens barrel, is provided with this prismatic glasses and this two spaced rings in this lens barrel, and this lens barrel is to process with the material of these two spaced rings different heat expansion coefficients at least wherein.

4. a projector lens is characterized in that, comprises:

At least three eyeglasses;

At least two spaced rings lay respectively between first this eyeglass and this second this eyeglass and between second this eyeglass and this three these eyeglasses, and these two spaced rings are made with the material of different heat expansion coefficient.

5. projector lens as claimed in claim 4 is characterized in that, these two spaced rings make this prismatic glasses first group of spacing separately, and when second temperature, make this prismatic glasses second group of spacing separately in order to when first working temperature; When this prismatic glasses forms the first picture plane during first group of spacing, and when second group of spacing, form the second picture plane, and this first is positioned on the same imaging surface as the plane as plane and this second.

6. projector lens as claimed in claim 4 is characterized in that, more includes lens barrel, is provided with this prismatic glasses and this two spaced rings in this lens barrel, and this lens barrel is to process with the material of these two spaced rings different heat expansion coefficients at least wherein.

7. a projector lens is characterized in that, comprises:

Lens barrel;

At least three eyeglasses are located in this lens barrel;

At least two spaced rings are located in this lens barrel, and lay respectively between first this eyeglass and this second this eyeglass and between second this eyeglass and this three these eyeglasses; Again, these two spaced rings at least wherein one to process with the material of this lens barrel different heat expansion coefficient.

8. projector lens as claimed in claim 7 is characterized in that, these two spaced rings make this prismatic glasses first group of spacing separately, and when second temperature, make this prismatic glasses second group of spacing separately in order to when first working temperature; When this prismatic glasses forms the first picture plane during first group of spacing, and when second group of spacing, form the second picture plane, and this first is positioned on the same imaging surface as the plane as plane and this second.

9. projector lens as claimed in claim 7 is characterized in that, these two spaced rings are made with the material of different heat expansion coefficient respectively.