CN102879990B - Projector lens cover opening and closing mechanism - Google Patents

Abstract

The invention relates to a lens cap opening and closing device of a projector, which is provided with a heating light source, a lens and a lens cap, wherein the heating light source is used for generating image light beams and heat energy when the projector is started; the lens is used for projecting the image light beam to an imaging surface; the lens cover can reciprocate between a first position for shielding the lens and a second position far away from the lens; the lens cap opening and closing device comprises a driving device which is connected with the lens cap and is provided with a thermal deformation piece, wherein the thermal deformation piece is positioned at a position which can receive the heat energy generated by the heating light source and is used for generating deformation after receiving the heat energy generated by the heating light source so as to enable the driving device to drive the lens cap to move from the first position to the second position, thereby achieving the purpose of opening the lens cap.

Description

Projector lens cover opening and closing mechanism

technical field

The present invention relates to a projector, and more specifically refers to a lens cover opening and closing device of a projector.

Background technique

With the advancement of imaging technology, projectors are widely used in presentations, conferences, education and training, or film and television entertainment, and have gradually become common video equipment for modern people. The projector mainly uses the lens to project image information to the imaging surface. If the lens is scratched or contaminated with dust, the image quality during projection will be affected. Therefore, a general projector is equipped with a lens cover to protect the lens from being scratched or dirty. However, since the lens cover is exposed on the outside of the projector, and the lens cover needs to be manually removed before the projector is used, the lens cover is easy to drop and lose, causing troubles to users.

For improving above-mentioned shortcoming, existing design has a kind of motorized lens cover, as No. 512255 patent of Chinese Taiwan Announcement, it utilizes the opening and closing of power supply to control stepping motor drive gear and rack structure to drive lens cover to open and close, And it can avoid the loss of the lens cover. However, the aforementioned motorized lens cover is not only complicated in components and difficult to maintain, but also consumes extra power to drive the motor to run. In addition, the opening and closing of the lens cover is controlled electrically. If the user shuts down the projector without closing the lens cover, the projector needs to be powered on again to close the lens cover, which affects the convenience of the user's operation.

Contents of the invention

The technical problem to be solved by the present invention is to provide a lens cover opening and closing device for a projector, which can automatically control the opening and closing of the lens cover, in view of the defect that the lens cover of the projector needs additional power to drive the motor to run in the prior art , without spending additional power.

The technical solution adopted by the present invention to solve the technical problem is to provide a lens cover opening and closing device of a projector, the projector has a heating light source, a lens and a lens cover, wherein the heating light source is used to start the projector When the image beam and thermal energy are generated; the lens is used to project the aforementioned image beam to the imaging surface; the lens cover can reciprocate between a first position shielding the lens and a second position away from the lens; the lens The cover opening and closing device includes a driving device, which is connected with the lens cover, and has a heat-deformable part. Afterwards, deformation occurs so that the driving device drives the lens cover to move from the first position to the second position.

According to the above idea, the opening and closing device for the lens cover of the present invention further includes a return device, which is connected to the lens cover to provide a force when the projector is closed, so as to drive the lens cover to move from the second position to the first position.

The opening and closing device for the lens cover of the projector according to the present invention has the following beneficial effects: not only the opening and closing of the lens cover can be controlled automatically, but also no extra power is needed.

Description of drawings

Fig. 1 is a schematic diagram of a preferred embodiment of the present invention.

Fig. 2 is a structural diagram of another amplification mechanism of the present invention.

Detailed ways

In order to illustrate the present invention more clearly, preferred embodiments are given and described in detail with accompanying drawings as follows.

Please refer to FIG. 1 , which is a projector 100 provided by a first preferred embodiment of the present invention. The projector 100 includes a heat-generating light source 110 , a lens 120 , a lens cover 130 and a lens cover opening and closing device 1 . Wherein, the heat-generating light source 110 is used to generate image beams and heat energy when the projector 100 is started. The lens 120 is used for projecting the aforementioned image light beam to an imaging surface (not shown). The lens cover 130 is used to cover the lens 120 when the projector 100 is turned off. In addition, since the heat-emitting light source 110 , the lens 120 and the lens cover 130 mentioned above belong to the prior art, the principle and detailed structure thereof will not be repeated here.

The lens cover opening and closing device 1 has a driving device 10 , and the driving device 10 includes a thermally deformable element 11 , an enlarging mechanism 12 and a transmission mechanism 13 .

The thermally deformable part 11 is a wire body made of unidirectional shape memory alloy (Shape Memory Alloy, SMA), but not limited thereto. The heat-deformable element 11 is located near the heat-emitting light source 110 to receive heat energy generated by the heat-emitting light source 110 . The heat-deformable member 11 will deform after receiving the heat energy generated by the heat-emitting light source 110 . Of course, in terms of design, the heat-deformable member 11 can also use length change, thickness change or other shape changes to achieve the effect of generating moving force in addition to the shape change.

The amplifying mechanism 12 includes a first lever 121 and a second lever 122 , and both the first lever 121 and the second lever 122 are first-type levers. One end of the first lever 121 is connected to the heat-deformable part 11, and the other end is connected to one end of the second lever 122, and the fulcrum 121a of the first lever 121 is located on the first lever 121 and is close to the point where the heat-deformable part 11 is connected. one end. The fulcrum 122 a of the second lever 122 is located on the second lever 122 close to one end connected to the first lever 121 , so that the other end of the second lever forms an active end whose movement is greater than the deformation of the heat-deformable member 11 .

The transmission mechanism 13 includes a flexible wire body 131 and a plurality of rollers 132 , the flexible wire body 131 is disposed along the rollers 132 and connected to the other end of the second lever 122 and the lens cover 130 . In this way, when the projector 100 is started, the heat energy generated by the heat-generating light source 110 will cause the heat-deformable member 11 to deform, thereby making the first lever 121 and the second lever 122 actuate, and the second lever The active end of 122 will drive the flexible wire 131 to drive the lens cover 130 to move from the first position P1 shielding the lens 120 to the second position P2 away from the lens 120 , so as to achieve the purpose of opening the lens cover 130 .

In addition, in addition to the amplifying mechanism 12 used in the above-mentioned embodiment, an amplifying mechanism 14 as shown in FIG. Line body 143; the wheel body 142 has a first circumferential surface 142a and a second circumferential surface 142b centered on the rotating shaft 141, and the perimeter of the second circumferential surface 142b is greater than the perimeter of the first circumferential surface 142a; the One end of the flexible wire body 143 is connected to the thermally deformable member 11, and the other end is connected to the first wheel surface 142a; one end of the flexible wire body 131 of the transmission mechanism 13 is connected to the second wheel surface 142b on. Thereby, when the heat-deformable member 11 is deformed, the flexible wire body 143 will drive the wheel body 142 to rotate, and at the same time drive the flexible wire body 131 to drive the lens cover 130 to move from the first position P2 to the second position P1, thereby achieving the purpose of opening the lens cover 130 . Of course, in terms of design, in addition to the above-mentioned structures, only a single lever can be used, or other existing structures such as gears and sprockets can be used to achieve the same purpose, and details will not be repeated here.

Furthermore, it should be noted that as long as the length of the thermally deformable member 11 is long enough, the amount of deformation during deformation will be sufficient to drive the lens cover 130 to move from the first position P1 to the second position P2. At this time, The lens cover opening and closing device 1 can achieve the purpose of opening the lens cover 130 without using the above-mentioned magnifying mechanisms.

It is worth mentioning that, after the projector 100 is closed, the lens cover 130 can cover the lens 120 again. It is connected with a fixed object (not shown) to provide force to the lens cover 130, so that the lens cover 130 is driven to move from the second position P2 back to the first position P1 after the projector 100 is closed. Of course, in addition to using springs in the design, elastic rubber or magnets can also be used to achieve the same purpose.

In addition to using the above-mentioned restoring device 20, a thermally deformable part made of a two-way shape memory alloy can also be used in design to replace the function of the restoring device 20, that is, when the projector 100 is started, the thermally deformable part is heated and Transform from the first shape to the second shape, and then drive the lens cover 130 to move from the first position P1 to the second position P2; and after the projector 100 is turned off, the heat-deformable part gradually cools down and deforms from the second shape When returning to the first shape, it will drive the lens cover 130 to move from the second position P2 back to the first position P1, thereby achieving the purpose of automatically opening and closing the lens cover 130 .

Based on the above, it can be seen that the lens cover opening and closing device 1 of the present invention can not only automatically control the opening and closing of the lens cover, but also does not need to consume extra power.

The above description is only a preferred feasible embodiment of the present invention, and any equivalent structure and manufacturing method changes made by applying the specification and claims of the present invention should be included in the patent scope of the present invention.

Claims (7)

1. a lens cap opening and closing device for projector, this projector has heat producing light sources, camera lens and lens cap, and wherein, this heat producing light sources, in order to when this projector starts, produces image strip and heat energy; This camera lens is in order to be projected to imaging surface by 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; It is characterized in that, this lens cap opening and closing device includes:

Drive unit, be connected with this lens cap, and there is thermal deformation part, this thermal deformation part be positioned at can receive the heat energy that this heat producing light sources produces position on, in order to after receiving the heat energy that produces of this heat producing light sources, produce distortion 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, the line body of this thermal deformation part made by marmem material.

3. the lens cap opening and closing device of projector as claimed in claim 1, it 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 be connected with this gear train; This enlarger moves in order to make this effect end according to the distortion of this thermal deformation part, and the amount of movement of this effect end is greater than the deflection of this thermal deformation part; This gear train is connected with this lens cap, and the driving of holding by this effect and this lens cap of transmission moves to this second place by this primary importance.

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 one end of this second lever, and the fulcrum of this first lever is positioned on this first lever close to the one end connecting this thermal deformation part; Other one end of this second lever is connected with this gear train, and the fulcrum of this second lever is positioned on this second lever close to the one end connecting this first lever.

5. the lens cap opening and closing device of projector as claimed in claim 4, it is characterized in that, this gear train comprises pliability line body, and its 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, be located at wheel body in this rotating shaft and pliability line body; This wheel body has the first periphery centered by this rotating shaft and the second periphery, 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 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, in order to provide acting force when this projector closes, use and drive this lens cap to move to this primary importance by this second place.