CN102879990A - Lens cover switching device for projection machine - Google Patents
Lens cover switching device for projection machine Download PDFInfo
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- CN102879990A CN102879990A CN2011101926418A CN201110192641A CN102879990A CN 102879990 A CN102879990 A CN 102879990A CN 2011101926418 A CN2011101926418 A CN 2011101926418A CN 201110192641 A CN201110192641 A CN 201110192641A CN 102879990 A CN102879990 A CN 102879990A
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- lens cap
- projector
- lever
- lens
- thermal deformation
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Abstract
The invention relates to a lens cover switching device for a projection machine. The projection machine comprises a heating light source, a lens and a lens cover, wherein the heating light source is used for generating an image light beam and heat energy when the projection machine is started; the lens is used for projecting the image light beam to an imaging surface; the lens cover can be moved between a first position which shields the lens and a second position far from the lens in a reciprocating way; the lens cover switching device comprises a driving device connected with the lens cover, and further comprises a thermal deformation component, wherein the thermal deformation component is positioned in a position where the heat generated via the heating light source can be received, and is used for being deformed after receiving the heat produced by the heating light source, therefore, the lens cover can move from the first position to the second position through the driving device, and the purpose of opening the lens cover can be achieved..
Description
Technical field
The present invention is relevant with projector, in more detail refers to a kind of lens cap opening and closing device of projector.
Background technology
Along with the progress of image science and technology, projector is widely used in bulletin, meeting, education and training or video display amusement, and becomes gradually the video device that the modern commonly uses.The main mat camera lens of projector is projected to imaging surface with image information, if camera lens is subject to scratch or is infected with dust, and the image quality in the time of can affecting projection.Therefore, general projector all is equipped with lens cap, in order to len, avoids camera lens scratch or dirty etc.Yet, be covered on the projector outside because this lens cap is exposed, and need manually this lens cap to be taken off before projector's use, the loss so that this lens cap drops easily, and cause user's puzzlement.
For improving above-mentioned shortcoming, have now and be designed with a kind of electrodynamic type lens cap, announce patent No. 512255 such as TaiWan, China, it utilizes the open and close of power supply to come control step motor driven wheel and rack structure to drive lens cap and opens and close, and can avoid the lens cap loss that comes off.Yet above-mentioned electrodynamic type lens cap not only member is complicated and maintenance is difficult for, and must additionally expend electric power and order about motor running.In addition, control the switching of lens cap in electronic mode, if the user covers lens cap namely first with projector's shutdown, need then again that the start power supply could cover lens cap, and affect the convenience that the user operates.
Summary of the invention
The technical problem to be solved in the present invention is, the defective that needs extra electric power to order about motor running for the lens cap of projector in the prior art, a kind of lens cap opening and closing device of projector is provided, can automatically controls the switching of lens cap, and need not spend extra power supply.
The present invention is that the technical scheme that its technical matters of solution adopts is, a kind of lens cap opening and closing device of projector is provided, and this projector has heating light source, camera lens and lens cap, wherein, this heating light source produces image strip and heat energy when starting in this projector; This camera lens is in order to be projected to imaging surface with aforesaid image strip; This lens cap can move back and forth between the primary importance of covering this camera lens and the second place away from this camera lens; This lens cap opening and closing device includes drive unit, be connected with this lens cap, and has the thermal deformation part, this thermal deformation part is positioned on the position that can receive the heat energy that this heating light source produces, in order to after receiving the heat energy that this heating light source produces, produce and be out of shape and make this drive unit drive this lens cap to move to this second place by this primary importance.
According to above-mentioned design, lens cap opening and closing device of the present invention more comprises return mechanism, and this return mechanism is connected with this lens cap, provides acting force when closing in this projector, uses this lens cap of drive and moves to this primary importance by this second place.
Implement the lens cap opening and closing device of projector of the present invention, have following beneficial effect: not only can automatically control the switching of lens cap, and need not spend extra power supply.
Description of drawings
Fig. 1 is the synoptic diagram of preferred embodiment of the present invention.
Fig. 2 is the structural drawing of another enlarger of the present invention.
Embodiment
For being illustrated more clearly in the present invention, hereby lifting preferred embodiment and cooperate accompanying drawing to be described in detail as follows.
See also Fig. 1, be the projector 100 that the present invention's the first preferred embodiment provides, this projector 100 includes heating light source 110, camera lens 120, lens cap 130 and lens cap opening and closing device 1.Wherein, this heating light source 110 produces image strip and heat energy when starting in this projector 100.This camera lens 120 is in order to be projected to the imaging surface (not shown) with aforesaid image strip.This lens cap 130 covers this camera lens 120 when closing in this projector 100.In addition, because this above-mentioned heating light source 110, this camera lens 120 and this lens cap 130 all belong to prior art, so its principle and detailed construction repeat no more in this appearance.
This lens cap opening and closing device 1 has drive unit 10, and this drive unit 10 includes thermal deformation part 11, enlarger 12 and gear train 13.
The line body that this thermal deformation part 11 is made by one-way shape memory alloy (Shape Memory Alloy, SMA) material, but not as limit.This thermal deformation part 11 is positioned near this heating light source 110, the heat energy that is produced to receive this heating light source 110.This thermal deformation part 11 will produce distortion behind the heat energy that receives these heating light source 110 generations.Certainly in design, this thermal deformation part 11 also can utilize length variations, thickness variation or other kenel to change to reach the effect that produces displacing force except utilizing change of shape.
This enlarger 12 includes the first lever 121 and the second lever 122, and this first lever 121 is all lever of first order with this second lever 122.These the first lever 121 1 ends are connected with this thermal deformation part 11, and the other end is connected with an end of this second lever 122, and the fulcrum 121a of this first lever 121 is positioned at an end that approaches this thermal deformation part 11 of connection on this first lever 121.The fulcrum 122a of this second lever 122 then is positioned at and approaches an end that connects this first lever 121 on this second lever 122, and makes this second lever other end form amount of movement greater than the effect end of the deflection of this thermal deformation part 11.
This gear train 13 includes pliability line body 131 and several rollers 132, and this pliability line body 131 arranges along these rollers 132, and connects the other end and this lens cap 130 of this second lever 122.By this, when this projector 100 starts, this heating light source produces 110 heat energy and will impel this thermal deformation part 11 to deform, and make this first lever 121 and these the second lever 122 starts, and the effect end of this second lever 122 will drive this pliability line body 131 and this lens cap 130 of transmission moves to second place P2 away from this camera lens 120 by the primary importance P1 that covers this camera lens 120, use to reach the purpose of opening lens cap 130.
In addition, except the used enlarger 12 of above-described embodiment, also can use enlarger 14 as shown in Figure 2, this enlarger 14 includes fixing rotating shaft 141, is located at wheel body 142 and pliability line body 143 in this rotating shaft; This wheel body 142 has the first periphery 142a and the second periphery 142b centered by this rotating shaft 141, and the girth of this second periphery 142b is greater than the girth of this first periphery 142a; One end of this pliability line body 143 is connected with this thermal deformation part 11, and the other end is arranged on this first wheel face 142a; Pliability line body 131 1 ends of this gear train 13 then are arranged on this second wheel face 142b.By this, when this thermal deformation part 11 distortion, to drive this wheel body 142 by this pliability line body 143 and rotate, and drive simultaneously this pliability line body 131 and drive these lens caps 130 and move to this second place P1 by this primary importance P2, and then reach the purpose of opening lens cap 130.Certainly in design, except above-mentioned structure, also can only use single lever, or with the purpose that cooperates such as other existing structures such as gear, sprocket wheels to reach identical, repeat no more in this appearance.
Moreover, what must illustrate is, as long as the length of this thermal deformation part 11 is enough long, deflection during its distortion can be enough to drive this lens cap 130 and move to this second place P2 by this primary importance P1, at this moment, this lens cap opening and closing device 1 needn't also can reach the purpose of opening lens cap 130 by each above-mentioned enlarger.
It is worth mentioning that, after this projector 100 is closed, this lens cap 130 can cover this camera lens 120 again, this lens cap opening and closing device 1 more includes return mechanism 20, be a spring, and be connected with this lens cap 130 and fixture (not shown), give this lens cap 130 in order to acting force to be provided, use after this projector 100 closes, drive this lens cap 130 and move back to this primary importance P1 by this second place P2.Certainly, except using spring, also can use the modes such as elastic caoutchouc or magnet magnetic to reach identical purpose in design.
And except using above-mentioned return mechanism 20, the function that also can replace with the thermal deformation part that the two-way shape memory alloys material is made in design return mechanism 20, that is, when starting projector 100, the thermal deformation part is heated and is deformed into the second shape by the first shape, and then drives this lens cap 130 and move to this second place P2 by this primary importance P1; And after projector 100 closed, the thermal deformation part cooled off gradually and when being out of shape back this first shape by this second shape, will driving this lens cap 130 and move back to this primary importance P1 by this second place P2, and then reach the purpose of this lens cap 130 of automatic open close.
Comprehensively the above can learn that lens cap opening and closing device 1 of the present invention not only can be controlled the switching of lens cap automatically, and need not spend extra power supply.
The above only is the better possible embodiments of the present invention, and the equivalent structure that all application instructions of the present invention and claim are done and method for making change, and ought to be included in the claim of the present invention.
Claims (7)
1. the lens cap opening and closing device of a projector is characterized in that, this projector has heating light source, camera lens and lens cap, and wherein, this heating light source produces image strip and heat energy when starting in this projector; This camera lens is in order to be projected to imaging surface with aforesaid image strip; This lens cap can move back and forth between the primary importance of covering this camera lens and the second place away from this camera lens; This lens cap opening and closing device includes:
Drive unit, be connected with this lens cap, and has the thermal deformation part, this thermal deformation part is positioned on the position that can receive the heat energy that this heating light source produces, in order to after receiving the heat energy that this heating light source produces, produce and be out of shape and make this drive unit drive this lens cap to move to this second place by this primary importance.
2. the lens cap opening and closing device of projector as claimed in claim 1 is characterized in that this thermal deformation part is by the made line body of marmem material.
3. the lens cap opening and closing device of projector as claimed in claim 1 is characterized in that this drive unit more includes enlarger and gear train, and this enlarger is connected with this thermal deformation part, has the effect end and is connected with this gear train; This enlarger makes this effect end mobile in order to the distortion according to this thermal deformation part, and should act on the amount of movement of end greater than the deflection of this thermal deformation part; This gear train is connected with this lens cap, and this lens cap of transmission moves to this second place by this primary importance by the driving of this effect end.
4. the lens cap opening and closing device of projector as claimed in claim 3, it is characterized in that, this enlarger includes the first lever and the second lever, one end of this first lever is connected with this thermal deformation part, the other end is connected with an end of this second lever, and the fulcrum of this first lever is positioned at an end that approaches this thermal deformation part of connection on this first lever; An other end of this second lever is connected with this gear train, and the fulcrum of this second lever is positioned at an end that approaches this first lever of connection on this second lever.
5. the lens cap opening and closing device of projector as claimed in claim 4 is characterized in that this gear train comprises pliability line body, and the one end connects this second lever, and the other end connects this lens cap.
6. the lens cap opening and closing device of projector as claimed in claim 3 is characterized in that this enlarger includes fixing rotating shaft, is located at wheel body and pliability line body in this rotating shaft; This wheel body has the first periphery and the second periphery centered by this rotating shaft, and the girth of this second periphery is greater than the girth of this first periphery; One end of this pliability line body is connected with this thermal deformation part, and the other end is arranged on this first wheel face; This gear train includes pliability line body, and the one termination is located on this second wheel face, and the other end then connects this lens cap.
7. the lens cap opening and closing device of projector as claimed in claim 1, it is characterized in that, more comprise return mechanism, be connected with this lens cap, provide acting force when closing in this projector, use driving this lens cap and move to this primary importance by this second place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110192641.8A CN102879990B (en) | 2011-07-11 | 2011-07-11 | Lens cover switching device for projection machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110192641.8A CN102879990B (en) | 2011-07-11 | 2011-07-11 | Lens cover switching device for projection machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102879990A true CN102879990A (en) | 2013-01-16 |
| CN102879990B CN102879990B (en) | 2015-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110192641.8A Expired - Fee Related CN102879990B (en) | 2011-07-11 | 2011-07-11 | Lens cover switching device for projection machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102879990B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432862A (en) * | 2002-01-14 | 2003-07-30 | 明基电通股份有限公司 | Lens cap assembly |
| JP2004145264A (en) * | 2002-08-30 | 2004-05-20 | Victor Co Of Japan Ltd | Projecter |
| US20050024605A1 (en) * | 2003-08-01 | 2005-02-03 | Funai Electric Co., Ltd. | Projector |
| JP2006201646A (en) * | 2005-01-24 | 2006-08-03 | Plus Vision Corp | Projector |
| US20060209271A1 (en) * | 2005-03-17 | 2006-09-21 | Clark Stephan R | Lens cover |
| CN1920659A (en) * | 2005-08-23 | 2007-02-28 | 明基电通股份有限公司 | Electronic device with portable lens cover |
| CN2914138Y (en) * | 2006-05-11 | 2007-06-20 | 华晶科技股份有限公司 | Multidisc lens cap mechanism |
| CN101114110A (en) * | 2006-07-27 | 2008-01-30 | 中强光电股份有限公司 | Lens cap device |
| JP2008102376A (en) * | 2006-10-19 | 2008-05-01 | Sanyo Electric Co Ltd | Lens cover slide mechanism and projection image display using the same |
| TW200909978A (en) * | 2007-08-17 | 2009-03-01 | Hon Hai Prec Ind Co Ltd | Lens cover assembly and projector using the same |
| CN201340511Y (en) * | 2009-01-09 | 2009-11-04 | 日立数字映像(中国)有限公司 | Automatic opening or closing lens cap component |
-
2011
- 2011-07-11 CN CN201110192641.8A patent/CN102879990B/en not_active Expired - Fee Related
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432862A (en) * | 2002-01-14 | 2003-07-30 | 明基电通股份有限公司 | Lens cap assembly |
| JP2004145264A (en) * | 2002-08-30 | 2004-05-20 | Victor Co Of Japan Ltd | Projecter |
| US20050024605A1 (en) * | 2003-08-01 | 2005-02-03 | Funai Electric Co., Ltd. | Projector |
| JP2006201646A (en) * | 2005-01-24 | 2006-08-03 | Plus Vision Corp | Projector |
| US20060209271A1 (en) * | 2005-03-17 | 2006-09-21 | Clark Stephan R | Lens cover |
| CN1920659A (en) * | 2005-08-23 | 2007-02-28 | 明基电通股份有限公司 | Electronic device with portable lens cover |
| CN2914138Y (en) * | 2006-05-11 | 2007-06-20 | 华晶科技股份有限公司 | Multidisc lens cap mechanism |
| CN101114110A (en) * | 2006-07-27 | 2008-01-30 | 中强光电股份有限公司 | Lens cap device |
| JP2008102376A (en) * | 2006-10-19 | 2008-05-01 | Sanyo Electric Co Ltd | Lens cover slide mechanism and projection image display using the same |
| TW200909978A (en) * | 2007-08-17 | 2009-03-01 | Hon Hai Prec Ind Co Ltd | Lens cover assembly and projector using the same |
| CN201340511Y (en) * | 2009-01-09 | 2009-11-04 | 日立数字映像(中国)有限公司 | Automatic opening or closing lens cap component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102879990B (en) | 2015-02-18 |
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