CN104166208B - Optical sheet wheel, light source system and projection system - Google Patents

Abstract

The embodiment of the invention discloses a kind of optical sheet runner, light-source system and optical projection system, this optical sheet runner includes rotary shaft and the stationary plane being fixed in this rotary shaft；Optical devices, set optical sheet on the rotating shaft including ring, and the external diameter of optical sheet is more than the external diameter of stationary plane；Stationary plane includes two vacancy sections, and each vacancy section is provided with glue application region and strutbeam group, and each glue application region is only interconnected and fixed with non-vacancy section by strutbeam group, and strutbeam group includes at least one strutbeam；Optical devices are only fixed by bonding with glue application region next and stationary plane；The strutbeam group of each vacancy section is less than the first predetermined value along the stiffness factor radially at the center crossing glue application region, the stress by this glue application region, Optical devices radially gone up when this strutbeam group produces deformation under predetermined temperature difference is made to be less than or equal to marginal value so that Optical devices subjected to stress is less than bringing it about broken stress marginal value.The present invention can provide a kind of and avoid optical sheet by the optical sheet runner of drawing crack.

Description

Optical sheet wheel, light source system and projection system

technical field

The invention relates to the technical field of illumination and display, in particular to an optical sheet wheel, a light source system and a projection system.

Background technique

The function of the color wheel in the DLP (Digital Light Processing) projector is the separation and processing of colors, and the separation and filtering of colors by the color wheel needs to be realized through the high-speed operation of the color wheel.

A disc-shaped filter wheel in the prior art is shown in FIG. 1A and FIG. 1B , FIG. 1A is a schematic structural view of the filter wheel in the prior art, and FIG. 1B is a top view of the filter wheel shown in FIG. 1A . The filter wheel 100 includes a filter 110 and a driving device for driving the filter 110 to rotate. The driving device includes a rotating shaft 121 and a bracket 122 fixed on the rotating shaft. The bracket 122 is ring-shaped, and the ring is arranged on the rotating shaft 121 and is perpendicular to the rotating shaft 121 . The optical filter 110 is formed by splicing and combining at least two sub-filters 111 , wherein each sub-filter 111 is arranged on the rotating shaft 121 and forms a circle, so that the overall optical filter 110 is annular. The optical filter 110 is parallel to the bracket 122 and is bonded and fixed to the bracket 122 by glue. The outer diameter of the bracket 122 is smaller than the outer diameter of the optical filter 110 , so that the bracket 122 avoids the propagation path of the light beam passing through the optical filter 110 .

When the filter wheel 100 rotates at a high speed, in order to prevent the filter 110 from flying out during the high-speed rotation, the filter 110 and the bracket 122 are generally fixed to each other by a relatively hard glue. However, the optical filter 110 will absorb part of the light during the working process, or other working parts will generate heat so that the temperature near the filter wheel 100 is relatively high, thereby causing the optical filter 110 and the support of the rotating shaft 121 to be heated. The manufacturing material of the optical filter and the manufacturing material of the support 122 on the rotating shaft 121 are different materials, generally the former is glass, and the latter is metal; because the thermal expansion coefficients of the optical filter and the rotating shaft do not match, the two are heated During the process, the filter was cracked due to the high stress it received.

Contents of the invention

The main technical problem to be solved by the invention is to provide an optical sheet rotating wheel which prevents the optical sheet from being pulled.

An embodiment of the present invention provides an optical sheet wheel, including:

An optical device and a driving device for driving the optical device to rotate, the driving device includes a rotating shaft and a fixed surface fixed on the rotating shaft, the fixing surface is arranged on the rotating shaft and is perpendicular to the rotating shaft;

The optical device includes a ring-shaped optical sheet, which is formed by splicing and combining at least two sub-optical sheet rings arranged on the rotation axis and perpendicular to the rotation axis; wherein the optical sheet in the optical device The outer diameter is greater than the outer diameter of the fixed surface, and the thermal expansion coefficient of the fixed surface is greater than the thermal expansion coefficient of the components fixed to the fixed surface in the optical device;

The fixed surface includes at least two hollowed out areas, wherein each hollowed out area is provided with a dispensing area and a support beam group, and each dispensing area is only connected and fixed to the non-hollowed out area of the fixed surface through the support beam group, Wherein the support beam group includes at least one support beam; the optical device is fixed to the fixing surface only by bonding with the dispensing area; wherein,

The stiffness coefficient of the beam group in each hollow area along the radial direction passing through the center of the dispensing area is less than a first predetermined value, so that when the beam group is deformed under a predetermined temperature difference, the pair passing through the dispensing area The stress of the optical device along the radial direction is less than or equal to a critical value, so that the stress suffered by the optical device is less than the critical stress value for breaking the optical device.

Preferably, the optical sheet in the optical device and the fixing surface are fixed to each other, wherein the number of hollow areas included in the fixing surface is greater than or equal to the number of sub-optical sheets in the optical sheet, and each sub-optical sheet corresponds to at least one The dispensing area in the cutout area.

Preferably, the optical device further includes a connecting piece, which is used to cover at least part of the junction of any two adjacent sub-optical sheets in the optical sheet and bond them together with each sub-optical sheet, and the thermal expansion coefficient of the connecting piece It matches the thermal expansion coefficient of the optical sheet.

Preferably, the connecting piece is an integral ring, and the outer diameter of the connecting piece is smaller than the outer diameter of the optical sheet, and the connecting piece is stacked with the fixing surface and the optical sheet.

Preferably, the connector includes at least two sub-connectors separated from each other, wherein each sub-connector covers at least part of at least one joint of the optical sheet.

Preferably, in each hollowed-out area on the fixed surface, the set of support beams is axially symmetrical with respect to a radius passing through the center of the glue dispensing area and the center of the fixed surface.

Preferably, in the fixing surface, each side of each dispensing area along the circumferential direction is connected and fixed to at most two support beams.

Preferably, in each hollow area on the fixed surface, on each of the beams in the beam group, a section of the beam connected to the dispensing area is vertically arc-shaped or straight, and the straight line is vertical The radius passing through the center of the dispensing area and the fixing surface.

Preferably, the thickness of each beam in the beam group along the direction perpendicular to the fixing surface is greater than or equal to 5 times the width of the beam in the radial direction.

Preferably, the optical device includes elastic pads and annular optical sheets that are laminated and bonded to each other, wherein the outer diameter of the optical sheet is larger than the outer diameter of the elastic pad;

The elastic pad in the optical device is only fixed to the fixed surface by bonding with the dispensing area; wherein,

The stiffness coefficient of the beam group in each hollow area along the radial direction passing through each dispensing area is less than the second predetermined value, so that when the beam group is deformed under a predetermined temperature difference, the pair passing through the dispensing area The stress of the optical device along the radial direction is less than or equal to a critical value, so that the stress experienced by the optical device is less than the critical stress value for breaking the optical device, wherein the second predetermined value is greater than the first predetermined value.

An embodiment of the present invention also provides a light source system, including:

light emitting means for generating light beams;

In the aforementioned optical sheet wheel, the optical sheet in the optical sheet wheel is used to receive the light beam from the light emitting device, and reflect or transmit at least part of the wavelength range of light in the light beam.

An embodiment of the present invention also provides a projection system, including:

the above-mentioned light source system;

The spatial light modulator is used to receive the light beam from the light source system and modulate it.

Compared with the prior art, the present invention includes the following beneficial effects:

In the present invention, since the optical device is only in contact with the dispensing area on the fixed surface, when the fixed surface expands or contracts in a high-temperature or low-temperature environment, only the movement on the dispensing area will cause stress on the optical device. And because the dispensing area is only connected and fixed by at least one support beam and the fixed surface, and the dispensing area and the support beam have no obstacles on both sides along the radial direction, so less force can make the support beam bend, and then make The dispensing area is displaced in the radial direction; therefore, when the fixed surface expands, the dispensing area remains relatively stationary or moves a small distance from the optical device under the stress between the dispensing area and the optical device, Move towards the center of the circle relative to the hollow area on the fixed surface; when the fixed surface shrinks, the dispensing area remains relatively stationary or moves a small distance from the optical device under the action of the stress, and the hollow area on the fixed surface Relatively move away from the center of the circle, so the optical device will not be subjected to stress beyond its bearing range, thereby preventing the optical device from cracking.

Description of drawings

FIG. 1A is a schematic structural view of a filter wheel in the prior art;

Figure 1B is a top view of the filter wheel shown in Figure 1A;

Figure 2A is a schematic structural view of an embodiment of the optical sheet wheel of the present invention;

Figure 2B is a bottom view of the optical device in the optical sheet runner shown in Figure 2A;

Figure 2C is a front view of the fixed surface in the optical sheet wheel shown in Figure 2A;

FIG. 2D is a schematic structural diagram of a hollowed-out area in the fixed surface shown in FIG. 2C;

2E is a schematic diagram of the principle of the fixed surface in the optical sheet wheel of the present invention;

3A is a schematic structural view of another embodiment of the fixed surface in the optical sheet wheel of the present invention;

Fig. 3B is a schematic structural diagram of a hollowed out area in the fixing surface shown in Fig. 3A;

4 is a schematic structural view of another embodiment of the optical sheet wheel of the present invention;

FIG. 5 is another structural schematic diagram of the optical device in the optical sheet carousel shown in FIG. 4 .

detailed description

For clarity of description, "upper" and "lower" described below all refer to upper and lower in the drawings.

Embodiments of the present invention will be described in detail below with reference to the drawings and implementation methods.

Embodiment one

Please refer to FIG. 2A . FIG. 2A is a schematic structural view of an embodiment of the optical sheet wheel of the present invention. The optical sheet rotating wheel includes an optical device and a driving device 2 for driving the optical device to rotate.

The optical device includes a circular optical sheet 11 . As shown in FIG. 2B , FIG. 2B is a bottom view of the optical device in the optical sheet wheel shown in FIG. 2A . In this embodiment, the optical sheet 11 is assembled by splicing four sub-optical sheets 11 a ringed on the rotating shaft 21 and perpendicular to the rotating shaft 21 . In this embodiment, the optical sheet 11 may include at least one of a filter, a diffuser, a light-transmitting sheet, and a reflective sheet, which are respectively used to filter, scatter, transmit, or reflect light beams. The optical sheet 11 is generally made of glass material. It is worth noting that the number of sub-optical sheets in the optical sheet 11 is only for illustration, and in practice, the optical sheet 11 can be formed by splicing more than or equal to two sub-optical sheets.

As shown in FIG. 2A , the driving device 2 includes a rotating shaft 21 and a support member 22 fixed on the rotating shaft 21 . The supporting member 22 is in the shape of an annular groove, the inner wall of the groove is ring-shaped on the rotating shaft 21 , and the bottom of the groove is a plane. The drive device 2 also includes a fixing surface 23 which is perpendicular to the axis of rotation 21 . In this embodiment, the fixing surface 23 is the bottom surface of the support member 22 . Since there will be a phenomenon of unbalanced rotation in the process of driving the optical device 1 to rotate by the driving device 2, it is possible to glue some copper balls or steel balls etc. somewhere in the groove-shaped support 22, or by 22, to make the optical device 1 maintain dynamic balance in the process of rotation.

Of course, the support member 22 is not limited to the groove shape, and can also be set in other shapes. In occasions where the dynamic balance does not need to be controlled very precisely, the support member 22 may not be provided. For example, the driving device 2 shown in Figure 1A can be directly provided with a fixed surface surrounding the rotating shaft 21 on the rotating shaft 21 of the driving device 2, and the fixed surface can be arranged on the top of the rotating shaft 21 or on The middle part; the fixed surface can also be integrally formed with the rotating shaft.

In this embodiment, the optical sheet 11 is fixed to the rotating shaft 21 by bonding to the fixing surface 23 of the driving device 2 , so that the driving device 2 is used to drive the optical sheet 11 to rotate. The outer diameter of the optical sheet 11 is larger than the outer diameter of the fixing surface 23 , so that the light beam can pass through the part of the optical sheet 11 beyond the fixing surface 23 .

The support member 22 is generally made of metal material (such as aluminum), so the thermal expansion coefficient of the fixing surface 23 is greater than that of the optical sheet 11 . In the prior art, the fixing surface 23 is a complete plane, and the entire contact surface between the optical sheet 11 and the fixing surface 23 is coated with a relatively hard glue to fix the optical sheet and the fixing surface 23 tightly. In this way, in the case of high or low temperature, the deformation produced by the fixed surface 23 is greater than the deformation produced by the optical sheet 11, so a greater stress will be generated on the optical sheet 11. When the stress is greater than the stress that the optical sheet can bear When the critical value is reached, where the critical value is the critical stress value that causes the optical device (in this embodiment, the optical device is an optical sheet) to break, the fixing surface 23 will tear the optical sheet 11 .

As shown in FIGS. 2C and 2D , FIG. 2C is a front view of the fixed surface of the optical sheet wheel shown in FIG. 2A , and FIG. 2D is a schematic structural diagram of a hollowed out area in the fixed surface shown in FIG. 2C . In this embodiment, four hollow areas 24 are provided on the fixing surface 23 , and the areas of the fixing surface 23 except the hollow areas 24 are non-hollow areas. Each hollow area 24 is composed of a glue dispensing area 25 , a beam set 26 and a through hole area 27 . In this embodiment, the combined shape of the dispensing area 25 and the support beam group 26 in the hollowed out area 24 is I-shaped; wherein the support beam group 26 includes four support beams 26a, 26b, 26c and 26d, and the support beams 26a and 26c are located at points On one side of the glue area 25 along the circumferential direction, the support beams 26b and 26d are located on the other side of the glue dispensing area 25 along the circumferential direction. The glue dispensing area 25 is surrounded by a through-hole area 27 , and each beam in the beam group 26 is connected and fixed to the non-hollowed area on the fixing surface 23 . When the optical sheet 11 is bonded and fixed to the fixed surface 23, glue is only dispensed on the dispensing area 25 of the fixed surface 23, and each dispensing area on the fixed surface 23 corresponds to each sub-optical sheet in the optical sheet , so that the optical sheet is fixed to the fixed surface 23 only by bonding with the glue point 25.

As shown in FIG. 2E , FIG. 2E is a schematic diagram of the principle of the fixed surface in the optical sheet wheel of the present invention. A stick of a certain material has opposite first end M and second end N, fix the first end M of the stick, and then apply a pressure F perpendicular to the initial direction of the stick to the other end N, at this When F does not make the stick exceed its elastic limit, the stick will be bent and elastically deformed, and the second end N will be displaced relative to the fixed position of the first end M, wherein the displacement along the direction of the pressure F is ΔX. The second end N of the stick can be equivalent to a spring, then the displacement conforms to Hooke's law, that is, F=k×ΔX, where k is the stiffness coefficient of the equivalent spring along the direction of the pressure F. It can be seen from the knowledge of mechanics that keeping other factors constant, the smaller the thickness of the stick along the direction of the pressure F, the smaller the k, and the larger the ΔX; the length of the stick (between the first end and the second end The larger the distance, the smaller the k, and the larger the ΔX.

When the optical sheet wheel is in a lower temperature environment, the components in the optical sheet wheel will shrink. However, each element shrinks to a different degree due to the different coefficients of expansion of the different elements. The material of the fixing surface 23 is metal, and the material of the optical sheet is glass, so the shrinkage of the fixing surface 23 is greater than that of the optical sheet. In this way, when the fixed surface 23 shrinks, the fixed surface 23 will drive each sub-optical sheet to move toward the center of the circle. Since the sub-optical sheets in the optical sheet are seamlessly spliced with each other and closely connected with the rotation axis, Each sub-optical sheet will squeeze each other and each sub-optical sheet will also squeeze each other with the rotating shaft. When the fixed surface 23 drives each sub-optical sheet to move, the stress that each sub-optical sheet bears is greater than the stress it can bear When the critical value is exceeded, each sub-optical sheet will be broken.

In this embodiment, the optical sheet is fixed to the fixed surface 23 only by bonding each dispensing area on the fixed surface, and each dispensing area is set in the hollow area on the fixing surface, and each dispensing area The zones are only interconnected with the non-perforated zones on the fixed surface by the beams in the beam group. Therefore, when the fixed surface expands or shrinks, the beam group in each hollowed out area will move away from the center of the circle or move toward the center of the circle as the non-hollowed out area expands or shrinks toward the center of the circle, and then Drive each dispensing area to move accordingly.

It can be seen from the principle shown in Figure 2E that compared with the prior art, due to the design of the support beam group in this embodiment, only a small force is required at the end of each support beam connected to the dispensing area. The end is displaced relative to the non-hollowed-out area. In this way, when the non-hollowed-out area of the fixing surface drives each beam in the beam group and then drives the glue dispensing area to move, the glue dispensing area generates a stress on the optical sheet through the glue. Correspondingly, the optical sheet generates a reaction force to the glue dispensing area through the glue, and under the reaction force, each beam undergoes elastic deformation.

For example, as shown in FIG. 2D , in a lower temperature environment, the fixing surface shrinks downwards, thereby generating a downward stress on the optical sheet through the glue. Therefore, the optical sheet generates an upward reaction force F1 to the glue dispensing area 25 through the glue. The glue dispensing area 25 then generates an upward force F2 on the end of each support beam connected to the glue dispensing area 25 . Due to the setting of each support beam, when the fixed surface shrinks downward, each support beam undergoes elastic deformation, and the end of each support beam connected to the dispensing area 25 is displaced relative to the non-hollowed-out area, that is, the non-hollowed-out area Displacement downwards, and one end of each support beam connected with the glue dispensing area 25 does not move or produces a small displacement downwards. In this way, the position of the dispensing area 25 remains unchanged or a small displacement occurs downward.

In order to make each support beam produce enough elastic deformation, so as to prevent the optical sheet from being pulled apart when each support beam undergoes elastic deformation, the design of each support beam set needs to make the support beam set pass through the point where it meets The stiffness coefficient in the radial direction of the center of the glue area is smaller than the first predetermined value, so that when the branch beam group is deformed under the predetermined temperature difference, the optical device (in this embodiment, the optical sheet) passes through each glue area along the radial direction. The upward stress is less than or equal to a threshold such that the optical device is subjected to a stress less than the threshold stress causing it to break.

In this embodiment, each sub-optical sheet corresponds to a glue dispensing area in a hollow area on the fixing surface. In practice, one sub-optical sheet can also correspond to the dispensing areas in at least two hollow areas on the fixed surface. In this way, the glue dispensing surface connecting the sub-optical sheet and the fixing surface can be enlarged, so that the optical sheet and the fixing surface can be fixed more firmly. The mutual fixing of one sub-optical sheet with only one dispensing area is beneficial to the convenience of processing, and the optical sheet and the fixing surface can be firmly fixed to each other by strengthening the strength of the glue.

In this embodiment, in order to make the stiffness coefficient of the support beam group along the radial direction of the center of the dispensing area connected with it smaller, each support beam in the support beam group 26 is preferably divided into a first section 261 and a second section 262, wherein the first section 261 is an end connected to the non-hollowed out area on the fixed surface 23, the second section 262 is an end connected to the dispensing area 25, and the length of the second section is greater than the length of the first section, the second section The direction of one segment is perpendicular to the direction of the second segment.

In this embodiment, in order to prevent each girder in each girder group on the fixing surface 23 from being deformed in the direction perpendicular to the fixing surface, preferably, the thickness of each beam in the girder group along the direction perpendicular to the fixing surface 23 greater than or equal to 5 times the radial width of the support beams, so as to increase the stiffness coefficient of each support beam group along the direction perpendicular to the fixing surface 23 .

In this embodiment, each hollowed out area 24 is preferably evenly distributed on the fixed surface 23, and the structure in each hollowed out area is symmetrical about the center, so that the fixed surface 23 is symmetrical about the center of the rotation axis, so that the fixed surface 23 is in the process of rotation. Keep dynamic balance.

In this embodiment, the beam group in each hollowed out area is preferably symmetrical about the radial axis of the center of the dispensing area 25 and the center of the fixed surface, so as to avoid the stress of the beam group on the dispensing area 25 and make the dispensing area 25 is displaced in directions other than along the radius, causing the position of each sub-optical sheet in the optical sheet to deviate from a predetermined position.

In this embodiment, the number included in each beam group may not be four, but other numbers. For example, as shown in Figure 3A and Figure 3B, Figure 3A is a schematic structural view of another embodiment of the fixed surface in the optical sheet wheel of the present invention, and Figure 3B is a structure of a hollowed out area in the fixed surface shown in Figure 3A schematic diagram. The difference between this embodiment and the embodiment shown in FIG. 2A is that in this embodiment, the support beam group 36 in each hollowed-out area in the fixed surface 33 has only two support beams 36a and 36b, which are respectively located in the dispensing area 35 along the periphery. It is used to connect and fix the glue dispensing area 35 and the non-hollowed out area on the fixing surface 33.

In this embodiment, each dispensing area is fixed to the non-hollowed-out area of the fixing surface by only one support beam respectively located on both sides. The stiffness coefficient in the radial direction of the center of the glue area is smaller, which is more conducive to the deformation of the support beam group.

In actual use, the number of the beams included in each beam group can be set arbitrarily, as long as the stiffness coefficient of the beam group in each hollow area along the radial direction passing through the center of the dispensing area is less than The first predetermined value is enough. Preferably, among the two sides of each dispensing area along the circumferential direction on the fixing surface, each side is connected and fixed to at most two support beams. In this way, the number of the support beam groups is small, so that the stiffness coefficient of the support beam groups along the radial direction passing through the center of the dispensing area connected thereto is small, which is beneficial to the actual processing design.

In the embodiment shown in FIG. 2A and FIG. 3A , at least one support beam is provided on both sides of each dispensing area along the circumferential direction. However, in practice, it is also possible that each dispensing area is provided with at least one support beam along one side of the circumferential direction, while the other side has no support beam but only a through-hole area. Preferably, each dispensing area is only provided with two brackets on one side along the circumferential direction, so that the dispensing area can only move in the circumferential direction perpendicular to the two supports without causing the dispensing area to move Displacement occurs in directions other than the radial direction passing through the dispensing area, causing the position of each sub-optical sheet in the optical sheet to deviate from a predetermined position.

In the above embodiments, the section of each support beam connected to the dispensing area is arc-shaped, such as the second section 262 of the support beam 26 in FIG. 2D , or the support beams 36a and 36b in FIG. 3B . In practical application, a section of each support beam connected with the dispensing area may also be in a straight line. Preferably, the straight line is perpendicular to the radial direction passing through the center of the dispensing area adjacent to it, so as to facilitate the deformation of the beam group.

Embodiment two

In Embodiment 1, each sub-optical sheet in the optical sheet is directly bonded to the fixed surface to form a ring-shaped optical sheet. During the high-speed rotation of the optical sheet rotating wheel, the glue between each sub-optical sheet and the fixed surface provides centripetal force for each sub-optical sheet, so that the optical sheet rotates accordingly. The greater the rotational speed of the optical sheet wheel, the greater the centripetal force. However, since the optical sheet is not a complete whole, when the glue is not hard enough, each sub-optical sheet will fly out. This embodiment provides a solution to this problem.

Please refer to FIG. 4 . FIG. 4 is a structural diagram of another embodiment of the optical sheet wheel of the present invention. The optical sheet rotating wheel includes an optical device 1 and a driving device 2 for driving the optical device 1 to rotate.

The difference between this embodiment and Embodiment 1 is:

In this embodiment, the optical device 1 further includes a connecting piece 12 . In this embodiment, the connecting piece 12 is located on the side of the optical sheet 11 facing away from the fixing surface 23, and the connecting piece 12 covers at least part of the junction of any two adjacent sub-optical sheets 11a in the optical sheet 11, and is connected with each sub-optical sheet 11a. Sheets 11a are bonded together. The thermal expansion coefficient of the connector 12 matches that of the optical sheet. Wherein the matching of the thermal expansion coefficients of the two means that at a predetermined temperature, during the rotation of the optical device, the connecting member and the optical sheet will not cause the two or one of the two to be damaged due to the difference in their respective thermal expansion coefficients. Ripped.

In this embodiment, both the connecting member 12 and the optical sheet 11 are made of glass. In practical application, the connecting member 12 and the optical sheet 11 can also be made of other same materials. Alternatively, the connecting member 12 and the optical sheet 11 may not be made of the same material, as long as the coefficients of thermal expansion of the two are matched during rotation at the working temperature. For example, the connecting member 12 and the optical sheet 11 may be Kovar and glass, respectively.

Specifically, in this embodiment, the connecting piece is integral, that is, in one piece. The connecting piece 12 is in the shape of a ring concentric with the optical sheet 11, and the ring is arranged on the rotating shaft 21, and the outer diameter of the connecting piece 12 is smaller than that of the optical sheet 11, so as to avoid the path of light beam propagation. Of course, in practice, if the connecting part is made of a light-transmitting material, the outer diameter of the connecting part may also be equal to or larger than the outer diameter of the optical sheet. The connecting piece 12 and the optical sheet 11 are glued together, and the fixing surface 23 , the optical sheet 11 and the connecting piece are stacked in sequence. Of course, in practice, the connecting piece 12 may not be ring-shaped but other regular or irregular shapes, as long as the connecting piece 12 can cover at least part of each joint in the optical sheet 11 . Preferably, the connecting piece 12 has a regular shape, so as to facilitate the dynamic balance of the optical sheet wheel during rotation. In practice, the connecting piece 12 may also be located between the optical sheet 11 and the fixing surface 23, and the fixing surface 23, the connecting piece 12 and the optical sheet 11 are sequentially stacked. In this way, the optical devices are fixed to each other by bonding the connecting member 12 to each dispensing area on the fixing surface 23 .

In this embodiment, the connecting piece and the optical sheet are bonded together, since the connecting piece covers at least part of the junction of any two adjacent sub-optical sheets in the optical sheet, the optical sheet and the connecting piece can be regarded as a complete overall. In this way, during the rotation of the optical sheet, the centripetal force provided for the rotation of the optical sheet is not only the force of the glue between the optical device and the fixed surface on the optical device, but also the optical device as a whole around the rotation axis. , to avoid the flying out of each sub-optical sheet in the process of rotation. Moreover, the thermal expansion coefficients of the optical sheet and the connector are matched, so that the two can be bonded together with a relatively hard adhesive, and the optical sheet and/or the connector will not be cracked when thermal expansion or contraction occurs.

In practice, the connecting piece 12 may not be a one-piece ring, but a whole ring formed by splicing at least two sub-pieces. It should be noted that, in order to make the optical device wrap around the rotating shaft 21 as a whole, the junction of any two adjacent sub-sheets in the connector needs to be staggered from the junction of any adjacent two sub-optical sheets in the optical sheet.

In this embodiment, the connector 12 may not be a one-piece whole, but includes at least two sub-connectors separated from each other, wherein each sub-connector covers at least part of at least one joint in the optical sheet 11 .

For example, as shown in FIG. 5 , FIG. 5 is another structural schematic diagram of the optical device in the optical sheet carousel shown in FIG. 4 . The difference from the embodiment shown in FIG. 4 is that the connector 12 includes four sub-connectors 12a, each sub-connector 12a is in the shape of a rectangular strip, and is arranged on the side of the optical sheet 11 facing away from the fixed surface, wherein each sub-connector 12a The connectors 12a are respectively parallel to the direction of a junction of the optical sheet 11, the length of each sub-connector is shorter than the length of each junction, and each sub-connector 12a is bonded to two sub-optical sheets on both sides of a junction, overlying the portion of the joint.

In this embodiment, each sub-connector 12a only covers part of each joint, which can save some materials and reduce costs. In practical applications, light-transmitting sub-connectors can also be used, and the length of each sub-connector 12a just covers the whole of each junction, which can make the connector and optical sheet 11 in the optical device 2 more bonded. Be firm.

In this embodiment, since the connecting parts are combined, the connecting parts use less material, less glue is used, and the cost is lower. In this embodiment, the connector 12 can also be located on the side of the optical sheet 11 facing the fixed surface, and at the same time, the area of each sub-connector should be large enough so that each sub-connector will simultaneously cover a joint on the optical sheet and the fixed surface A dispensing area on the In this way, the optical device is fixed to the rotating shaft through the bonding of the connecting piece and the fixing surface.

In the embodiment shown in FIG. 4 and FIG. 5 , when the connecting member 12 is disposed between the optical sheet and the fixing surface, the connecting member 12 is preferably an elastic pad. Since the elastic coefficient of the connecting piece is relatively high, the thermal expansion coefficient of the connecting piece may not match the thermal expansion coefficient of the optical sheet. In this way, when the fixing surface is deformed at high temperature or low temperature to drive the deformation of the optical device, the stress on the optical sheet can be further reduced due to the high elastic coefficient of the connecting piece. Therefore, when designing the support beam group in the hollow area on the fixed surface, the stiffness coefficient of the support beam group along the radial direction of the center of the dispensing area connected to it is less than the second predetermined value, so that in Under the predetermined temperature difference, when the beam group is deformed, the stress on the optical device (in this embodiment, the optical sheet and the elastic pad) passing through each dispensing area in the radial direction is less than or equal to the critical value, so that the optical device The stress received is less than the stress critical value that causes it to break. It is easy to understand that the second predetermined value is greater than the first predetermined value, so the design requirements for the support beam group on the fixed surface in this embodiment are lower than those in the above embodiments, which is more conducive to actual processing.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

An embodiment of the present invention also provides a light source system, including an optical sheet wheel and a light emitting device. The optical sheet wheel may have the structures and functions in the above-mentioned embodiments; the light emitted by the light emitting device is incident on the optical sheet wheel On the optical sheet, the optical sheet is used to reflect or transmit at least part of the wavelength range of light in the light beam. An embodiment of the present invention also provides a projection system, including the above-mentioned light source system and a spatial light modulator, where the spatial light modulator is configured to receive and modulate a light beam from the light source system. The projection system may adopt various projection technologies, such as liquid crystal display (LCD, Liquid Crystal Display) projection technology, digital light path processor (DLP, Digital Light Processor) projection technology. In addition, the above-mentioned light-emitting device can also be applied to lighting systems, such as stage lighting.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (12)

1. An optical sheet runner, characterized in that, comprising: An optical device and a driving device for driving the optical device to rotate, the driving device includes a rotating shaft and a fixed surface fixed on the rotating shaft, the fixing surface is arranged on the rotating shaft and is perpendicular to the rotating shaft; The optical device includes a ring-shaped optical sheet, which is formed by splicing and combining at least two sub-optical sheet rings arranged on the rotation axis and perpendicular to the rotation axis; wherein the optical sheet in the optical device The outer diameter is greater than the outer diameter of the fixed surface, and the thermal expansion coefficient of the fixed surface is greater than the thermal expansion coefficient of the components fixed to the fixed surface in the optical device; The fixed surface includes at least two hollowed out areas, wherein each hollowed out area is provided with a dispensing area and a support beam group, and each dispensing area is only connected and fixed to the non-hollowed out area of the fixed surface through the support beam group, Wherein the support beam group includes at least one support beam; the optical device is fixed to the fixing surface only by bonding with the dispensing area; wherein, The stiffness coefficient of the beam group in each hollow area along the radial direction passing through the center of the dispensing area is less than a first predetermined value, so that when the beam group is deformed under a predetermined temperature difference, the pair passing through the dispensing area The stress of the optical device along the radial direction is less than or equal to a critical value, so that the stress suffered by the optical device is less than the critical stress value for breaking the optical device. 2. The optical sheet wheel according to claim 1, wherein the optical sheet in the optical device and the fixing surface are fixed to each other, wherein the number of hollow areas included in the fixing surface is greater than or equal to that of the optical sheet The number of sub-optical sheets in each sub-optical sheet corresponds to at least one dispensing area in the hollowed out area. 3. The optical sheet rotator according to claim 1, wherein the optical device further comprises a connector for covering at least part of the junction of any two adjacent sub-optical sheets in the optical sheet and connecting with The sub-optical sheets are bonded together, and the thermal expansion coefficient of the connecting part matches that of the optical sheets. 4. The optical sheet runner according to claim 3, wherein the connecting piece is an integral ring, and the outer diameter of the connecting piece is smaller than the outer diameter of the optical sheet, and the connecting piece and the connecting piece are The fixed surface and the optical sheets are stacked. 5. The optical sheet runner according to claim 3, characterized in that: The connector includes at least two sub-connectors separated from each other, wherein each sub-connector covers at least part of at least one joint of the optical sheet. 6. The optical sheet runner according to any one of claims 1 to 5, characterized in that, in each hollow area on the fixed surface, the support beam group passes through the center of the dispensing area and The radius of the center of the fixing surface is axisymmetric. 7. The optical sheet runner according to any one of claims 1 to 5, characterized in that, in the fixed surface, among the two sides of each dispensing area along the circumferential direction, each side is connected with at most two branches The beams are connected to each other and fixed. 8. The optical sheet runner according to any one of claims 1 to 5, characterized in that, in each hollow area on the fixed surface, on each branch beam in the branch beam group, the branch beam and the The section connected to the dispensing area is arc-shaped or linear, and when the section of the beam connected to the dispensing area is linear, the straight section is perpendicular to the section connected to it. Radial from the center of the dispensing zone. 9. The optical sheet runner according to any one of claims 1 to 5, characterized in that, the thickness of each beam in the beam group along the direction perpendicular to the fixing surface is greater than or equal to the thickness of the beam along the 5 times the width in the radial direction. 10. The optical sheet wheel according to claim 1, comprising: The optical device includes elastic pads and annular optical sheets that are stacked and bonded to each other, wherein the outer diameter of the optical sheet is larger than the outer diameter of the elastic pad; The elastic pad in the optical device is only fixed to the fixed surface by bonding with the dispensing area; wherein, The stiffness coefficient of the beam group in each hollow area along the radial direction passing through the center of the dispensing area connected to it is smaller than the second predetermined value, so that when the beam group is deformed under a predetermined temperature difference, the dispensing The radial stress of the region on the optical device is less than or equal to a critical value, so that the optical device is subjected to a stress less than the stress critical value causing it to break, wherein the second predetermined value is greater than the first predetermined value. 11. A light source system, characterized in that it comprises: light emitting means for generating light beams; The optical sheet wheel according to any one of claims 1 to 10, the optical sheet in the optical sheet wheel is used to receive the light beam from the light emitting device, and reflect or transmit at least part of the wavelength range of the light beam Light. 12. A projection system, characterized in that it comprises: The light source system according to claim 11; The spatial light modulator is used to receive the light beam from the light source system and modulate it.