Color wheel rotating speed measuring device, color wheel device and ray machine

Abstract

The utility model relates to the technical field of light sources, and provides a color wheel rotating speed measuring device which comprises a circuit board, a sensor, a supporting part and light-transmitting glass, the sensor is arranged on the circuit board and used for emitting detection light and receiving reflected detection light, the supporting part is arranged on the circuit board and located on the outer side of the sensor, and the light-transmitting glass is arranged on the supporting part. The light-transmitting glass is arranged on the supporting part and covers the sensor, and detection light can penetrate through the light-transmitting glass. By arranging the light-transmitting glass at the sensor, the detection light can pass through the light-transmitting glass, and meanwhile part of stray light is filtered out, so that the detection interference of other external light rays on the sensor can be reduced, and the measurement precision of the rotating speed of the color wheel is improved. In addition, the embodiment of the utility model further provides a color wheel device and an optical machine.

Description

Technical Field

[0001] This application relates to the field of light source technology, specifically to a color wheel speed measuring device, a color wheel device, and an optomechanic. Background Technology

[0002] Projection equipment is widely used in various fields such as home, automotive, and commercial offices. Current projection equipment typically uses fluorescent light sources, which generate fluorescence by excitation light illuminating a wavelength conversion device. A color wheel is a commonly used wavelength conversion device, usually containing phosphors of various colors. When excitation light is incident on different colored phosphors, different colors of fluorescence are formed. To accurately control the generation of different colors of fluorescence, the rotation speed of the color wheel needs to be highly precise; therefore, measuring the rotational speed of the color wheel is crucial.

[0003] The requirements for projection equipment vary depending on the application scenario. For example, in home scenarios, the sensing conditions of speed sensors are simple, and the measurements are usually quite accurate. With the rapid increase in demand for products used in automotive projection (HUD / vehicle projection / vehicle headlights, etc.), the sensing conditions of speed sensors that meet automotive-grade requirements are more stringent. They require a shorter sensing distance from the target object and are more susceptible to the influence of ambient stray light, resulting in larger measurement errors. Utility Model Content

[0004] This application provides a color wheel speed measuring device, a color wheel device, and an optical engine to at least partially improve the above-mentioned technical problems.

[0005] The embodiments of this application are implemented through the following technical solutions.

[0006] In a first aspect, embodiments of this application provide a color wheel rotation speed measuring device, including a circuit board, a sensor, a support, and a light-transmitting glass. The sensor is disposed on the circuit board and is used to emit detection light and receive reflected detection light. The support is disposed on the circuit board and located outside the sensor. The light-transmitting glass is disposed on the support and covers the sensor, and the light-transmitting glass can transmit detection light.

[0007] In some embodiments, the light-transmitting glass is provided with a filter film layer, which is used to filter out non-detection light.

[0008] In some embodiments, the distance between the light-transmitting glass and the sensor is no greater than 0.2 mm.

[0009] In some embodiments, the height of the support is lower than the height of the sensor.

[0010] In some embodiments, the support is any one or more of metal, plastic, and glass, and the translucent glass is bonded to the support.

[0011] Secondly, embodiments of this application also provide a color wheel device, including the aforementioned color wheel rotation speed measuring device and a color wheel module. The color wheel module includes a bracket, a color wheel, a motor, a sensing tape, and a reflective sheet. The color wheel is rotatably mounted on the bracket, and the color wheel is disposed opposite to the sensor. The motor is used to drive the color wheel to rotate. The reflective sheet is disposed on the surface of the color wheel facing the sensor, and the sensing tape is disposed on the reflective sheet.

[0012] In some embodiments, the center of the sensing tape is positioned to correspond to the light-emitting center of the sensor.

[0013] In some embodiments, the distance between the color wheel and the sensor is no greater than 2 mm.

[0014] In some embodiments, the color wheel device further includes a lens assembly, the lens assembly including a lens holder, and the circuit board fixed to the lens holder.

[0015] Thirdly, this application also provides an optical engine, including a housing and the aforementioned color wheel device, wherein the color wheel device is fixed to the inner wall of the housing.

[0016] The color wheel speed measuring device, color wheel device, and optomechanic provided in this application embodiment, by setting a light-transmitting glass at the sensor, allows the detection light to pass through while filtering out some stray light, thus reducing the interference of other external light on the sensor's detection and improving the measurement accuracy of the color wheel speed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an optical engine provided in an embodiment of this application.

[0019] Figure 2 This is a cross-sectional structural diagram of an optical engine provided in an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the structure of a color wheel rotation speed measuring device in an optical engine provided in an embodiment of this application.

[0021] Figure 4 This is a schematic diagram of a partial structure of a color wheel speed measuring device in an optical engine provided in an embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the structure of a color wheel module in an optical engine provided in an embodiment of this application.

[0023] Figure 6 This is a schematic diagram of the structure of a color wheel module in an optical engine provided in an embodiment of this application from another perspective.

[0024] Figure 7 This is a schematic diagram of the installation structure of a color wheel speed measuring device in an optical engine provided in an embodiment of this application. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] Projection equipment is widely used in various fields such as home, automotive, and commercial offices. Current projection equipment typically uses fluorescent light sources, which generate fluorescence by excitation light illuminating a wavelength conversion device. A color wheel is a commonly used wavelength conversion device, usually containing phosphors of various colors. When excitation light is incident on different colored phosphors, different colors of fluorescence are formed. To accurately control the generation of different colors of fluorescence, the rotation speed of the color wheel needs to be highly precise; therefore, measuring the rotational speed of the color wheel is crucial.

[0027] The requirements for projection equipment vary depending on the application scenario. For example, in home scenarios, the sensing conditions of speed sensors are simple, and the measurements are usually quite accurate. With the rapid increase in demand for products used in automotive projection (HUD / vehicle projection / vehicle headlights, etc.), color wheels have begun to be widely used in automotive projection products. However, speed sensors that meet automotive-grade requirements have more stringent sensing conditions, require a smaller sensing distance from the target object, and are more susceptible to the influence of ambient stray light, resulting in larger measurement errors.

[0028] Based on this, the inventors of this application have proposed a color wheel speed measuring device, a color wheel device, and an optical engine to at least partially improve the above-mentioned technical problems. The present invention will be described in detail below with reference to specific embodiments.

[0029] Please refer to the following: Figure 1 and Figure 2 This embodiment provides an optical engine 10, which includes a housing 20 and a color wheel device 30, wherein the color wheel device 30 is disposed inside the housing 20.

[0030] Specifically, the housing 20 forms an accommodating space for accommodating various components of the optomechanical system 10, including but not limited to excitation light sources, lens systems, etc., which will not be described in detail in this embodiment. In this embodiment, the housing 20 includes a side shell and a top cover 21. The top cover 21 is disposed on one side of the side shell and is connected to the side shell to seal it.

[0031] The color wheel device 30 is disposed inside the housing 20 and serves as part of the light source of the optical engine 10. In this embodiment, the color wheel device 30 is fixed to the inner wall of the housing 20 by screws 11, specifically to the inner wall of the upper cover 21. Of course, in some other embodiments, the color wheel device 30 may also be fixed to other positions of the housing 20, and this embodiment does not limit this.

[0032] Please continue reading. Figure 2 The color wheel device 30 includes a color wheel speed measuring device 50 and a color wheel module 40. The color wheel speed measuring device 50 measures the speed of the color wheel 42 in the color wheel module 40. Please refer to the following documentation in this embodiment. Figure 3 and Figure 4 The color wheel speed measuring device 50 may include a circuit board 51, a sensor 52, a support 53, and a light-transmitting glass 54, wherein the sensor 52, the support 53, and the light-transmitting glass 54 are all mounted on the circuit board 51.

[0033] Specifically, in this embodiment, the sensor 52 is disposed on the circuit board 51. The sensor 52 is a rotation speed sensor. It is understood that the rotation speed sensor can be a sensing device based on various measurement principles, and this embodiment does not limit it. The sensor 52 is used to emit detection light and receive reflected detection light, and to determine the rotation speed of the object under test based on the time from the emission of the detection light to the receipt of the reflected detection light. In some embodiments, the detection light is light of a specific wavelength band, such as infrared light. Of course, the detection light can also be light of other wavelength bands, and this embodiment does not limit it. Furthermore, in order to further improve the anti-interference capability of the detection light, the detection light can also be encrypted. For example, by pulse width modulation of the infrared light, the detection light is given additional encoded information. After receiving the reflected infrared light, the sensor 52 can perform decoding processing, thereby avoiding interference from other external light and improving measurement accuracy.

[0034] The support portion 53 is disposed on the circuit board 51 and located outside the sensor 52. The support portion 53 is used to support the light-transmitting glass 54. The support portion 53 can be disposed in various ways, such as by welding, by adhesive, or by screws 11. This embodiment does not limit the specific method of placement.

[0035] In this embodiment, the support portion 53 can be metal. Specifically, the support portion 53 includes a metal strip, which is connected to the circuit board 51 by welding. The metal strip can maintain a certain distance from the sensor 52 to avoid interfering with the detection light emitted by the sensor 52. For example, the distance between the metal strip and the sensor 52 can be greater than or equal to 1 mm. The metal strip can be configured in various shapes to facilitate the placement of the light-transmitting glass 54. In this embodiment, the metal strip is configured as a ring structure and surrounds the sensor 52. The ring-shaped metal strip is more convenient during welding, which simplifies the manufacturing process. At the same time, the ring-shaped metal strip facilitates the subsequent placement of the light-transmitting glass 54, so that the light-transmitting glass 54 can be kept approximately perpendicular to the light emission axis of the sensor 52. In other embodiments, the metal strip can also be strip-shaped, curved, etc., which is not limited in this embodiment.

[0036] The number of metal strips can be one, two, or more; this embodiment does not limit this. The metal strips can be made of various materials, such as aluminum, tin, and copper; this embodiment does not limit this either. In some other embodiments, the support portion 53 can also be made of plastic or glass and fixed to the circuit board 51 by adhesive bonding; in other embodiments, the support portion 53 can be made of any two or three of metal, plastic, and glass simultaneously. For example, the four sides of the support portion 53 can be surrounded by metal, plastic, and / or glass respectively; this embodiment does not limit this either.

[0037] The light-transmitting glass 54 is disposed on the support portion 53 and covers the sensor 52. Covering the sensor 52 means that the orthographic projection of the light-transmitting glass 54 on the circuit board 51 completely covers the orthographic projection of the sensor 52 on the circuit board 51. The area of ​​the light-transmitting glass 54 can be larger than the projected area of ​​the sensor 52 to improve the light-blocking effect. The light-transmitting glass 54 allows detection light to pass through, so the detection light emitted by the sensor 52 and the detection light reflected back by the object under test can pass through the light-transmitting glass 54. The light-transmitting glass 54 can filter at least a portion of non-detection light, which refers to light other than the wavelength of the detection light. For example, the light-transmitting glass 54 can be made of a filter material. In one embodiment, the light-transmitting glass 54 is provided with a filter film layer (not shown in the figure). The filter film layer is used to filter out non-detection light while allowing detection light to pass through. For example, the filter film can transmit long-wavelength infrared light and reflect short-wavelength visible light. This arrangement allows for selective setting of corresponding filter film layers according to the wavelength of the detection light, reducing the manufacturing difficulty and cost of the light-transmitting glass 54.

[0038] The light-transmitting glass 54 can be adhesively bonded to the support 53. To minimize the gap between the light-transmitting glass 54 and the sensor 52, the height of the support 53 can be set slightly lower than that of the sensor 52, for example, by 0.05-0.1 mm. Here, the height refers to the dimension of the sensor 52 along the optical axis of its emitted detection light. The advantage of this arrangement is that the adhesive layer between the light-transmitting glass 54 and the metal strip allows the light-transmitting glass 54 to be slightly higher than the sensor 52, while the gap between the light-transmitting glass 54 and the sensor 52 is sufficiently small. Preferably, the gap between the light-transmitting glass 54 and the sensor 52 is no greater than 0.2 mm. This further reduces the possibility of the sensor 52 being interfered with by other external interference light. For example, the gap between the light-transmitting glass 54 and the sensor can be 0.05-0.1 mm, or other values. It is understandable that in some application scenarios, such as those with lower measurement accuracy requirements, the distance between the light-transmitting glass 54 and the sensor 52 can also be set to be greater than 0.2 mm. This embodiment does not limit this.

[0039] By placing a light-transmitting glass 54 at the sensor 52, the detection light can pass through while filtering out some stray light. This reduces interference from other external light sources on the sensor 52 and improves the measurement accuracy of the rotational speed of the color wheel 42. In addition, a temperature sensor 55 can be placed on the circuit board to collect temperature information.

[0040] In this embodiment, see Figure 5 and Figure 6The color wheel module 40 includes a bracket 41, a color wheel 42, a motor 43, a sensing tape 45, and a reflector 44. The bracket 41 is used to mount the color wheel 42 and can be fixed to the inner wall of the housing 20. The color wheel 42 is rotatably mounted on the bracket 41 and is positioned opposite to the sensor 52. The motor 43 drives the color wheel 42 to rotate. The reflector 44 is disposed on the surface of the color wheel 42 facing the sensor 52. The reflector 44 is used to reflect the detection light incident on it and can be made of aluminum, such as high-reflectivity aluminum. The sensing tape 45 is disposed on the reflector 44. The sensing tape 45 can be used to mark the position of the reflector 43.

[0041] The reflector 44 can be positioned offset from the phosphor on the color wheel 42 without affecting its normal operation. During the rotation of the color wheel 42, the detection light emitted from the sensor 52 is incident on the color wheel 42 and reflected by the reflector 43. The reflected light is then received by the sensor 52 again. When the detection light is incident on the sensing tape 45, it is absorbed, resulting in minimal or no reflection back to the sensor 52. The sensor 52 can then determine the rotational speed of the color wheel 42 based on the difference in values ​​between the reflected and emitted detection light, and the duration for which the sensor receives relatively stable reflected light before the difference occurs. When setting the reflector 43, it can be set to an approximately arc-shaped structure along the rotation circumference of the color wheel 42. Similarly, the sensing tape 45 can also be set to an arc-shaped structure. By setting the reflector 43 and / or the sensing tape 45 to be ring-shaped, the detection light emitted by the sensor 52 can produce a difference at any time within one rotation cycle of the color wheel, which can improve the measurement accuracy.

[0042] In order to ensure that the detection light emitted by the sensor 52 can be accurately incident on the sensing tape 45 and the reflector 43, the center of the sensing tape 45 can be set to correspond to the light emission center of the sensor 52. The light emission center of the sensor 52 refers to the center of the optical axis of the detection light emitted by the sensor 52, and the center of the sensing tape 45 refers to the center of the width direction of the sensing tape 45.

[0043] Please refer to the following in this embodiment: Figure 1 and Figure 7The color wheel speed measuring device 50 also includes a lens bracket 60, which is used to mount a lens 61. The lens 61 can be used to collimate and homogenize the fluorescence converted by the color wheel 42, etc., but this embodiment does not limit this. The lens bracket 41 is fixed inside the housing 20, and the color wheel speed measuring device 50 can be set inside the housing 20 and fixed to the inner wall of the housing 20. In order to further reduce the space occupied by the setting of the color wheel speed measuring device 50, in this embodiment, the circuit board 51 of the color wheel speed measuring device 50 can be directly fixed to the lens bracket 60 by screws 11. This setting method does not require an additional bracket 41, which can save space in the optical engine 10. At the same time, since the lens set on the lens bracket 60 corresponds to the light-emitting area of ​​the color wheel 42, so that the optical path coincides, the color wheel speed measuring device 50 is set on the lens bracket 41, offset from the light-emitting area of ​​the color wheel 42, and corresponds to the reflector 43 and the sensing tape 45. The positions match each other, and the setting is also relatively convenient. Furthermore, since the lens holder 60 and the holder 41 are positioned close to each other, the relative distance between the sensor 52 and the color wheel 42 can be set smaller, preferably within 2 mm, and more preferably within 1 mm. Therefore, when the sensor 52 performs measurements, the path of the detected light is shorter, reducing the possibility of interference from other light sources and improving the measurement accuracy of the sensor 52. It should be noted that, since the relative distance between the sensor 52 and the color wheel 42 is no greater than 2 mm, and even less than 1 mm, if the support 53 is positioned higher than the sensor 52, the transparent glass 54, positioned behind the support 53, will occupy the gap between the sensor 52 and the color wheel, causing interference and affecting the accuracy of the sensor.

[0044] Of course, it is understood that in some other embodiments, the color wheel speed measuring device 50 may also be installed on a separate bracket, and this embodiment does not limit this.

[0045] The color wheel speed measuring device 50, color wheel device 30, and optomechanical system 10 provided in this embodiment, by setting a light-transmitting glass 54 at the sensor 52, allows the detection light to pass through while filtering out some stray light. Therefore, the interference of other external light on the detection of the sensor 52 can be reduced, and the measurement accuracy of the speed of the color wheel 42 can be improved.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A color wheel speed measuring device, characterized in that, include: Circuit board; A sensor, disposed on the circuit board, is used to emit detection light and receive reflected detection light; A support portion is disposed on the circuit board and located outside the sensor; as well as A light-transmitting glass is disposed on the support and covers the sensor, and the light-transmitting glass can transmit detection light.

2. The color wheel speed measuring device according to claim 1, characterized in that, The transparent glass is provided with a filter film layer, which is used to filter out non-detection light.

3. The color wheel speed measuring device according to claim 1, characterized in that, The distance between the light-transmitting glass and the sensor is no greater than 0.2 mm.

4. The color wheel speed measuring device according to claim 1, characterized in that, The height of the support is lower than the height of the sensor.

5. The color wheel speed measuring device according to claim 1, characterized in that, The support portion is any one or more of metal, plastic, and glass, and the light-transmitting glass is bonded to the support portion.

6. A color wheel device, characterized in that, include: The color wheel speed measuring device as described in any one of claims 1-5; as well as A color wheel module includes a bracket, a color wheel, a motor, a sensing tape, and a reflective sheet. The color wheel is rotatably mounted on the bracket and is positioned opposite to the sensor. The motor drives the color wheel to rotate. The reflective sheet is disposed on the surface of the color wheel facing the sensor, and the sensing tape is disposed on the reflective sheet.

7. The color wheel device according to claim 6, characterized in that, The center of the sensing tape is set to correspond to the light-emitting center of the sensor.

8. The color wheel device according to claim 6, characterized in that, The distance between the color wheel and the sensor is no more than 2mm.

9. The color wheel device according to any one of claims 6 to 8, characterized in that, The color wheel device also includes a lens assembly, which includes a lens bracket, and the circuit board is fixed to the lens bracket.

10. An optical engine, characterized in that, include: The housing and the color wheel device as described in any one of claims 6-8, wherein the color wheel device is fixed to the inner wall of the housing.

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