Anti-glare filter module for a projector

Abstract

The invention relates to an anti-glare filter module (1) for a projector (20), the anti-glare filter module (1) having: • at least one filter disc (2, 3), which is made as a diffusion filter; • at least one frame module (4), on which the filter disc (2, 3) is mounted so as to be able to slide along a direction of travel (100); • wherein the frame module (4) is made to position the anti-glare filter module (1) on an optical path (200) of the projector (20) such that the direction of travel (100) is oriented transversely to the optical path (200); • wherein the frame module (4) has a rotatably mounted drive element (5), which is made to be rotated by a user; • wherein the frame module (4) has a force transmission system (6), which is made to transmit a force between the drive element (5) and the disc filter (2, 3) for sliding,By rotating the attack element (5), the filter disk (2, 3) moves, in whole or in part, along the optical path (200) in the direction of movement (100). Figure 1,

Description

Title of the invention: Anti-glare filter module for a projector

[0001] The invention relates to an anti-glare filter module for a projector. Furthermore, the invention relates to a projector with such an anti-glare filter module.

[0002] Anti-glare filter modules are known in the prior art. These filters, also called diffusers, diffuse and refract light to increase the light-emitting surface area. This makes it possible, for example, to attenuate or soften harsh, glaring light.

[0003] The invention aims to improve the handling and safety of an anti-glare filter.

[0004] The solution to said objective is achieved by the features of the independent claim. The sub-claims contain preferred improvements of the invention.

[0005] The anti-glare filter module for a projector has at least one filter disc and at least one frame module. The filter disc is implemented as a diffusion filter. This means that the filter disc refracts and diffuses the light to increase the light exit area. The filter disc is mounted so that it can slide along the frame module in a direction of movement. The frame module is designed to position the anti-glare filter module on an optical path of the projector such that the direction of movement is oriented transversely to the optical path. In particular, the direction of movement is oriented perpendicularly to the optical path. It is therefore possible to move the filter disc along the direction of movement on the optical path to generate an anti-glare effect, i.e., diffused light.Similarly, the filter disc can be moved along the direction of travel away from the optical path to avoid any anti-glare effect. In particular, all intermediate positions are possible to produce a partial anti-glare effect. The frame module can be positioned, or is positioned, in a fixed manner relative to the optical path, or it can slide along the optical path, for example, on a lens carriage.

[0006] The frame module has a rotatably mounted attack element. The attack element is, for example, a rotating handle. The attack element is designed to be rotated by a user. The frame module has a force transmission system designed for transmitting force between the element The attack element and the filter disk are connected. In this way, the force transmission system is designed to transform a rotation of the attack element into a translational movement of at least one filter disk along the direction of travel. This allows, by rotating the attack element, the filter disk to be moved, in whole or in part, along the optical path in the direction of travel.

[0007] The anti-glare effect is adjusted by the anti-glare filter module entirely manually. The driver element allows the user to adjust the anti-glare effect and its degree. The anti-glare effect can be adjusted continuously, from zero, where at least one filter disc is located outside the optical path, to full, where the entire optical path passes through at least one filter disc. Adjusting the anti-glare effect is thus simple, effortless, and intuitive.

[0008] Preferably, the anti-glare filter module comprises a first filter disc and a second filter disc. The first and second filter discs are respectively implemented as diffusion filters and have particularly advantageously identical properties. Furthermore, it is preferably provided that the first and second filter discs are movably mounted on the frame module along the same direction of movement. Thanks to the force transmission system, the first and second filter discs move in opposite directions, and both filter discs can be moved by the same driving element. It is thus possible to adjust the position of the two filter discs by means of a driving element. This allows for optimal adjustment of the anti-glare effect.

[0009] Advantageously, the first and second filter discs can be moved relative to each other between a first and a second final position. In the first final position, the first and second filter discs are positioned outside the optical path. In particular, both filter discs are positioned completely outside the optical path in the first final position. In the second final position, the first and second filter discs are positioned entirely within the optical path. This means that the entire optical path, i.e., in particular all the light emitted by the projector, passes through at least one of the two filter discs. Between the two final positions, the two filter discs are, in particular, continuously adjustable. It is thus possible to continuously adjust an anti-glare effect.

[0010] Furthermore, it is particularly advantageous for the first filter disc and the second filter disc to be arranged offset from each other. In particular, the first filter disc and the second filter disc are arranged on The two filter discs are positioned at different points along the optical path. It is preferred that the two filter discs overlap, at least partially, in their second final position relative to the optical path. In other words, there are areas of the optical path where light passes through both the first and second anti-glare discs. This staggered arrangement of the two filter discs ensures that they cannot collide. This increases the safety of the anti-glare filter module.

[0011] The power transmission system preferably comprises a belt that passes between two pulleys. The belt is, in particular, a toothed belt. The belt can be moved by the drive element. Each filter disc is coupled to the belt. Consequently, the movement of the belt can achieve the displacement of one or more filter discs, in particular the first and second filter discs described. If two filter discs are present, it is preferably provided that the two filter discs are arranged on the belt in opposite sections, that is, on different sides with respect to a pulley. This results in the two filter discs moving in opposite directions when the belt is moved. Depending on the direction of movement of the belt, the two filter discs move closer together or further apart.The kinematics of the filter discs can thus be implemented simply and effortlessly. Alternatively, the force transmission system could also incorporate other force transmission elements, such as gears or friction wheels, or similar components.

[0012] At least one filter disc is preferably fixed to at least one slide. The slide is movable, in particular along a guide rod of the frame module. Preferably, each filter disc is fixed to at least two slides, with at least two parallel guide rods provided to receive the slides. Advantageously, each slide of a filter disc has its own guide rod. If several filter discs are present, preferably each guide rod receives at least two slides, one slide being fixed to one of the filter discs. Furthermore, preferably the slide is fixed to the belt. If several slides are provided per filter disc, only one of the slides is thus preferably connected to the belt.Advantageously, all the slides connected to the belt are mounted on the same guide rod. The connection between the slide and the belt is achieved in particular by complementary shape and / or force.

[0013] At least one slide rests in particular on a slide stop when at least one filter disk is completely outside the optical path. The slides of the two filter disks rest in particular on slide stops. respective when the first filter disc and the second filter disc are in the first final position.

[0014] In the second final position, the slides fixed to different filter discs preferably rest on one another. In particular, the slides fixed to the first filter disc rest on the slides fixed to the second filter disc. The slides thus form reciprocal stops that prevent further movement of the filter discs relative to each other. This prevents the filter discs from moving beyond the second final position.

[0015] At least one filter disc is rigidly connected to a stop element. The stop element is coupled, in particular, to the filter disc in a fixed manner. The stop element is advantageously fixed to a slide on which the filter disc is also fixed. Relative displacement between the slide, the filter disc, and the stop element is thus avoided or at least minimized. The stop element is designed to prevent displacement of another projector component within the movement range of the filter disc when the filter disc is positioned, at least partially, in the optical path. The other component is, in particular, a movable optical system of the projector. It may be necessary for the optical system to be able to move into the movement range of at least one filter disc, or in particular, of both filter discs.To prevent a collision between the other component and at least one filter disc, the movement of the other component is limited by its contact with the stop element when at least one filter disc is inserted into the optical path, up to the point where a collision is likely. Since the stop element moves in conjunction with the filter disc, a simple and reliable blocking mechanism is achieved by mechanically preventing the other component from moving. Alternatively, the stop element is designed to limit the movement of at least one filter disc by contact with another projector component when the other component is within the filter disc's movement range. Similar to the case described above, a collision is also prevented when the other component has already been retracted into the filter disc's movement range.In this case, the stop element rests on the other component before a collision can occur, thus preventing further movement of at least one filter disc along the direction of travel. A collision is therefore avoided simply and reliably by mechanical locking.

[0016] At least one filter disk preferably has a recess that allows another component of the projector, in particular a movable optical system of the projector, to be grasped in a movement zone of the filter disk when the The filter disk is moved out of the optical path. The recess reduces the travel of at least one filter disk so as not to block the movement of the other component.

[0017] The invention also relates to a projector. The projector has a light source designed to direct light along an optical path of the projector. Furthermore, the projector has an anti-glare filter module as described above. The anti-glare filter module is located on the optical path. Preferably, the frame module of the anti-glare filter module is fixed relative to the optical path and / or the light source. Alternatively, the frame module is arranged so that it can slide along the optical path. In particular, it is not possible to move the frame module out of the optical path. For example, the frame module is fixed to a housing of the projector.

[0018] The projector advantageously features an optical system that can slide relative to the anti-glare filter module. At least a partial area of ​​the optical system is designed to move within the movement area of ​​at least one filter disc. Thus, the movement areas of at least one filter disc and the optical system overlap. As described previously, a stop element is particularly advantageously a stop element that prevents a collision between at least one filter disc and the optical system.

[0019] Other details, advantages and features of the present invention will become apparent from the following description of exemplary embodiments with reference to the figures, which show:

[0020] [Fig. 1] a schematic representation of a projector according to an example of an embodiment of the invention,

[0021] [Fig.2] a schematic representation of an anti-glare filter module according to an example of an embodiment of the invention,

[0022] [Fig.3] a schematic representation of the anti-glare filter module according to the exemplary embodiment of the invention in a first position, and

[0023] [Fig.4] a schematic representation of the anti-glare filter module according to the embodiment of the invention in a second position.

[0024] Figure 1 schematically illustrates a projector 20 according to an embodiment of the invention. The projector 20 has a light source 17 and an optical system 18, which are respectively arranged in a housing 19 of the projector 20. The light source 17 serves to send light along an optical path 200 of the projector 20. The optical system 18 is movable relative to the housing 19 and can therefore, in particular, adjust different zoom levels.

[0025] The projector 20 also includes an anti-glare filter module 1 which is located on the optical path 200. The anti-glare filter module 1 is adjustable and can be operated manually by a user. For this purpose, movable filter discs 2, 3 are provided, as will be explained later. Components of the anti-glare filter module 1 are housed on the casing 19 in such a way as to allow the anti-glare filter module 1 to slide along the optical path 200. The anti-glare filter module 1 always remains located on the optical path 200. The optical system 18 can be slid relative to the anti-glare filter module 1, in particular along the optical path 200. It is provided that at least a partial area of ​​the optical system 18 is designed to be moved within the movement area of ​​the filter discs 2, 3.

[0026] Figure 2 schematically represents an anti-glare filter module 1 according to an embodiment of the invention which can be used in a projector 20 according to Figure 1. In said embodiment, the anti-glare filter module 1 has two filter discs 2, 3, a first filter disc 2 and a second filter disc 3. The two filter discs 2, 3 are made as diffusion filters and in particular have identical properties.

[0027] In addition, the anti-glare filter module 1 has a frame module 4. The frame module 4 serves to fix the anti-glare filter module 1 onto a component of the projector 20, in particular onto the housing 19 of the projector 20. The frame module 4 is arranged in particular in a fixed position relative to the optical path 200 of the projector 20.

[0028] The first filter disc 2 and the second filter disc 3 are respectively mounted so as to be able to slide along a direction of movement 100 on the frame module 4. For this purpose, in the embodiment shown, each filter disc 2, 3 is fixed on two slides 10. Each slide 10 is arranged so as to be able to be moved along a guide rod 9 of the frame module 4, the guide rods 9 being oriented parallel to the direction of movement 100. In the embodiment shown, two guide rods 9 are present, two slides 10 being installed on each guide rod 9, one of the slides being respectively fixed on one of the filter discs 2, 3.

[0029] The mobility of the filter discs 2, 3 allows them to be inserted into and removed from the optical path 200. The filter discs 2, 3 can also be partially inserted into the optical path 200. This allows for adjusting the anti-glare effect of the projector 20, particularly in continuous operation. The direction of movement 100 is oriented at least transversely, preferably vertically in the illustrated embodiment, with respect to the optical path 200.

[0030] The first filter disc 2 and the second filter disc 3 are offset from each other. In particular, the first filter disc 2 and the second filter disc 3 are not located at the same position along the optical path 200, so that the filter discs 2, 3 can overlap with respect to the optical path 200. This makes it possible, in particular, to avoid a collision of the filter discs 2, 3. The movement of the filter discs 2, 3 relative to each other is limited only by the stop of the slides 10 against each other.

[0031] To move the first filter disc 2 and the second filter disc 3, the frame module 4 has a rotatingly mounted drive element 5. The drive element 5 is designed to be grasped by a user and is made to be rotated by a user. Furthermore, the frame module 4 features a force transmission system 6 designed to transmit force between the drive element 5 and the filter discs 2 and 3. Specifically, this force transmission system converts the rotation of the drive element 5 into the sliding of the filter discs 2 and 3 along the direction of travel 100. Consequently, the filter discs 2 and 3 can be slid fully or partially along the optical path 200. The necessary force is applied by the user applying a rotational torque to the drive element 5. A separate actuator is not required.

[0032] The force transmission system 6 has a belt 7, which is in particular a toothed belt. The belt 7 is arranged between two pulleys 8. One of the pulleys 8 is rotationally fixed to an intermediate belt sprocket 14, the intermediate belt sprocket 14 being connected to the drive element 5 by an intermediate belt 15. Consequently, a rotation of the drive element 5 by a user can cause the belt 7 to move between the pulleys 8.

[0033] Each filter disc 2, 3 is coupled to the belt 7. In the embodiment shown, this is achieved by coupling a slide 10, which is connected to the first filter disc 2 and the second filter disc 3, to the belts 7. For example, the respective slide 10 is fixed to the belt 7 by complementary shape and / or force. The coupling of the respective slides 10 to the belt 7 is carried out on different sections of the belt 7, so that the first filter disc 2 and the second filter disc 3 are movable relative to each other opposite to the force transmission system 6 along the direction of travel 100.

[0034] By rotating the attack element 5, the first filter disc 2 and the second filter disc 3 can be moved relative to each other between a first final position and a second final position. The first final position is shown in [Fig. 3], in which, in the first final position, the first filter disc 2 and the second filter disc 3 are arranged externally, in particular completely outside the optical path 200. The second final position is shown in [Fig.4], with the first filter disk 2 and the second filter disk 3 arranged completely on the optical path 200. As described previously, the first filter disk 2 and the second filter disk 3 overlap in the second final position.

[0035] In the first final position, the slides 10 rest on slide stops 16. The slide stops 16 limit the movement of the slides 10 and therefore of the filter discs 2, 3. In the embodiment shown, the slide stops 16 also serve as support for the guide rods 9.

[0036] In the second final position, the slides 10, which are connected to the first filter disc 2, rest on the slides 10, which are connected to the second filter disc 3. This again limits the mobility of the slides 10 and therefore of the filter discs 2, 3.

[0037] In both the first and second final positions, a user cannot continue to rotate the attack element 5, because further movement of the filter discs 2, 3 along the direction of travel 100 towards each other or away from each other is blocked. This allows the user to easily identify the end of the travel zone.

[0038] At least one filter disc 2, 3 is rigidly connected to a stop element 11. In the illustrated embodiment, this is achieved by installing the stop element 11 on a slide 10 of the first filter disc 2. The stop element 11 is designed to prevent the filter discs 2, 3 from colliding with the optical system 18. Thus, the stop element 11 is designed to limit the movement of the optical system 18 and to prevent the optical system 18 from colliding with one of the filter discs 2, 3 when the filter discs 2, 3 are inserted at least partially into the optical path 200. The optical system 18 is designed to move within the movement range of the filter discs 2, 3. If the filter discs 2, 3 are in their first final position, there is no risk of collision.The filter discs 2, 3 also have recesses 2a, 3a which allow the optical system 18 to engage with the movement zone of the filter discs 2, 3 without collision. However, if the filter discs 2, 3 are positioned partially or entirely on the optical path 200, there is a risk of collision with the optical system 18. In this case, the stop element 11 acts as a stop for the optical system to limit its movement and prevent a collision between the optical system 18 and the filter discs 2, 3.

[0039] The stop element 11 also serves as a stop for the filter discs 2, 3. Thus, the stop element 11 is designed to limit the movement of the filter discs 2, 3 by bearing against the optical system 18 when the optical system 18 is already within the movement zone of the filter discs 2, 3. Therefore, a collision between the discs Filters 2 and 3, and optical system 18, are also avoided in this case. Thus, regardless of which component is moving, a collision is always avoided.

[0040] In the embodiment shown, the frame module 4 has a retaining plate 12. The retaining plate 12 serves as a support and has an opening 21 through which the optical path passes.

[0041] In addition to the text of the description of the invention above, explicit reference is made to the figures representing the invention to supplement its disclosure. List of reference numbers

[0042] 1 Anti-glare filter module

[0043] 2 First filter disc

[0044] 3 Second filter disc

[0045] 4 Frame Module

[0046] 5 Attack Element

[0047] 6 Power transmission system

[0048] 7 Belt

[0049] 8 Pulleys

[0050] 9 Guide rods

[0051] 10 Slide

[0052] 11 Stop element

[0053] 12 Base plate

[0054] 13 Slide stop

[0055] 14 Intermediate pulley

[0056] 15 Intermediate belt

[0057] 16 Slide stop

[0058] 17 Light source

[0059] 18 Optical system

[0060] 19 Housing

[0061] 20 Projectors

[0062] 21 Opening

[0063] 100 Direction of movement

[0064] 200 Optical path

Claims

Demands

1. Anti-glare filter module (1) for a projector (20), the anti-glare filter module (1) having • at least one filter disc (2, 3), which is made as a diffusion filter, • at least one frame module (4), on which the filter disc (2, 3) is mounted so as to be able to slide along a direction of travel (100), wherein the frame module (4) is made to position the anti-glare filter module (1) on an optical path (200) of the projector (20) such that the direction of travel (100) is oriented transversely to the optical path (200), wherein the frame module (4) has a rotatably mounted drive element (5), which is made to be rotated by a user, wherein the frame module (4) has a force transmission system (6), which is made to transmit a force between the drive element (5) and the disc filtering (2,3) to slide, by rotation of the attack element (5), the filtering disc (2, 3) in whole or in part along the optical path (200) along the direction of movement (100).

2. Anti-glare filter module (1) according to claim 1, characterized by a first filter disc (2) and a second filter disc (3), which are respectively made as diffusion filters, in particular with identical properties, in which the first filter disc (2) and the second filter disc (3) are movablely mounted on the frame module (4) along the direction of travel (100) and are movable relative to each other opposite to the force transmission system (6).

3. Anti-glare filter module (1) according to claim 2, characterized in that the first filter disc (2) and the second filter disc (3) can be moved relative to each other between a first end position and a second end position, wherein the first filter disc (2) and the second filter disc (3) are arranged in the first end position outside, in particular completely outside, the optical path (200) and in which the first filter disk (2) and the second filter disk (3) are arranged in the second final position entirely on the optical path (200).

4. Anti-glare filter module (1) according to claim 2 or 3, characterized in that the first filter disc (2) and the second filter disc (3) are arranged in an offset manner relative to each other, wherein the filter discs (2, 3) overlap at least partially preferably in the second final position relative to the optical path (200).

5. Anti-glare filter module (1) according to any one of the preceding claims, characterized in that the force transmission system (6) has a belt (7), in particular a toothed belt, which extends between two pulleys (8) and which can be moved by the driving element (5), in which each filter disc (2, 3) is coupled to the belt (7).

6. Anti-glare filter module (1) according to any one of the preceding claims, characterized in that at least one filter disc (2, 3) is fixed on at least one slide (10), in which the slide (10) is arranged so as to be able to be moved along a guide rod (9) of the frame module (4), and in which in particular the slide (10) is fixed on the belt (7), specifically in particular by complementarity of form and / or by force.

7. Anti-glare filter module (1) according to any one of the preceding claims, characterized in that at least one filter disc (2, 3) is rigidly connected to a stop element (11), which is configured, • to prevent movement of another projector component (20) in a movement zone of the filter disc (2, 3) when the filter disc (2, 3) is disposed at least partly on the optical path (200), and / or, • to limit movement of the filter disc (2, 3) by placing it on another projector component (20) when the other component is in a movement zone of the filter disc (2, 3).

8. Anti-glare filter module (1) according to any one of the preceding claims, characterized in that at least one filter disk (2, 3) has a recess (2a, 3a) which allows another component of the projector (20) to be grasped in a movement area of ​​the filter disk (2, 3) when the filter disk (2, 3) is moved out of the optical path (200).

9. Projector (20) having a light source (11), which is configured to emit light along an optical path (200), and an anti-glare filter module (1) according to any one of the preceding claims, wherein the anti-glare filter module (1) is disposed on the optical path (200).

10. Projector (20) according to claim 9, characterized by an optical system (18) which can be slid relative to the anti-glare filter module (1), in which at least a partial area of ​​the optical system (18) is configured to be moved in the area of ​​movement of at least one filter disc (2, 3).

Images