JP2022188564A - Phosphor wheel device and light emitting module - Google Patents

Abstract

An object of the present invention is to provide a device having a mechanism capable of detecting the direction of rotation of a phosphor wheel. A first detection part (31) and a second detection part (32) of a phosphor wheel (100) have a minimum radius of a circumference around a rotation axis (A1) through which at least one of the first detection part (31) and the second detection part (32) passes. is the third value, and the maximum radius of the circumference through which at least one of the first detection unit 31 and the second detection unit 32 passes is the fourth value, the rotation axis A1 is the fifth value in the range of the third value or more and the fourth value or less, the length of the first detection unit 31 passing on the circumference and the length of the second detection unit 32 arranged to differ in length. [Selection drawing] Fig. 2

Description

The present disclosure relates to phosphor wheel devices and light emitting modules.

A technique is known in which a light-emitting element and a phosphor wheel device are provided, and light from the light-emitting element is made incident on the phosphor wheel to extract fluorescence. Further, Patent Document 1 discloses an illumination device provided with a detector for detecting light from a detection pattern in order to detect an abnormality in a rotating plate provided with a phosphor layer.

JP 2015-031876

An object of the present disclosure is to provide a device having a mechanism capable of detecting the direction of rotation of a phosphor wheel.

A phosphor wheel device disclosed in an embodiment comprises a substrate, a wavelength conversion unit provided on the substrate including one or more phosphors for converting the wavelength of light, and a first phosphor provided on the substrate. a phosphor wheel having a detection unit and a second detection unit; a support member that rotatably supports the phosphor wheel; and a driving unit that rotates the phosphor wheel about a rotation axis of the phosphor wheel. , wherein the wavelength conversion section is arranged so as to pass through a first circumference centered on the rotation axis and having a radius of a first value, and the first detection section and the second detection section are configured to The first detection unit and the second detection unit are arranged so as to pass through a second circumference whose center is the axis and whose radius is a second value different from the first value, and the first detection unit and the second detection unit are centered on the rotation axis. A value of a minimum radius of a circumference through which at least one of the first detection section and the second detection section passes is set as a third value, and at least one of the first detection section and the second detection section is centered on the rotation axis. On a circle centered on the rotation axis and having a fifth value in the range of a third value or more and a fourth value or less, where the maximum radius of the passing circle is a fourth value, The length of the first detection section passing on the circumference and the length of the second detection section passing on the circumference are arranged to be different.

Further, the light-emitting module disclosed in the embodiment includes the phosphor wheel device disclosed in the embodiment, and one or more first light-emitting devices that emit light having a peak wavelength of a first wavelength to the wavelength conversion unit. and a rotation detection unit having a light emitting section that emits detection light to a position through which the first detection section and the second detection section pass by rotation of the phosphor wheel, and a light receiving section that receives the detection light. Prepare.

According to the embodiments of the present disclosure, since the direction of rotation of the phosphor wheel can be detected, it is possible to confirm whether the device is operating in the correct direction of rotation.

1 is a plan view of a light emitting module according to an embodiment; FIG. 1 is a perspective view of a phosphor wheel device according to an embodiment; FIG. 1 is a plan view of a phosphor wheel according to an embodiment; FIG. FIG. 3B is a graph showing an example of temporal change in the amount of received light in the rotation detection unit when the phosphor wheel shown in FIG. 3A rotates clockwise; FIG. FIG. 3B is a graph showing an example of temporal change in the amount of light received in the rotation detection unit when the phosphor wheel shown in FIG. 3A rotates counterclockwise; FIG. FIG. 3B is a cross-sectional view of the phosphor wheel shown in FIG. 3A taken along the IV-IV cross-sectional line; FIG. 10 is a plan view of a phosphor wheel according to a modified example; FIG. 5B is a graph showing an example of temporal change in the amount of received light in the rotation detection unit when the phosphor wheel shown in FIG. 5A rotates clockwise; FIG. FIG. 5B is a graph showing an example of temporal change in the amount of light received in the rotation detection unit when the phosphor wheel shown in FIG. 5A rotates counterclockwise; FIG. FIG. 10 is a plan view of a phosphor wheel according to a modified example; FIG. 6B is a graph showing an example of temporal changes in the amount of received light in the rotation detection unit when the phosphor wheel shown in FIG. 6A rotates clockwise; FIG. FIG. 6B is a graph showing an example of temporal change in the amount of light received in the rotation detection unit when the phosphor wheel shown in FIG. 6A rotates counterclockwise. FIG. FIG. 10 is a plan view of a phosphor wheel according to a modified example; FIG. 10 is a plan view of a phosphor wheel according to a modified example; FIG. 8B is a graph showing an example of temporal change in the amount of light received in the rotation detection unit when the phosphor wheel shown in FIG. 8A rotates clockwise; FIG. FIG. 8B is a graph showing an example of temporal change in the amount of light received in the rotation detection unit when the phosphor wheel shown in FIG. 8A rotates counterclockwise. FIG. FIG. 10 is a plan view of a phosphor wheel according to a modified example; FIG. 9B is a graph showing an example of temporal change in the amount of received light in the rotation detection unit when the phosphor wheel shown in FIG. 9A rotates clockwise; FIG. FIG. 9B is a graph showing an example of temporal change in the amount of light received in the rotation detection unit when the phosphor wheel shown in FIG. 9A rotates counterclockwise. FIG. FIG. 11 is a plan view of a light-emitting module according to a modified example;

In the present specification and claims, regarding polygons such as triangles and quadrilaterals, polygons include shapes with corners rounded, chamfered, chamfered, rounded, etc. shall be called. In addition, not only the corners (ends of sides) but also shapes in which intermediate portions of sides are processed are called polygons. In other words, shapes that are partially processed while leaving a polygon as a base shall be included in the interpretation of "polygon" described in this specification and claims.

The same applies to words that express specific shapes, such as trapezoids, circles, and unevenness, in addition to polygons. The same is true when dealing with each side forming the shape. In other words, even if a corner or intermediate portion of a certain side is processed, the processed portion is also included in the interpretation of "side". When distinguishing a partially unprocessed "polygon" or "side" from a processed shape, add "strict" and describe it as, for example, "strict quadrilateral". .

In addition, in this specification or the scope of claims, expressions such as up and down, left and right, front and back, front and back, front and back only describe the relationship of relative positions, orientations, directions, etc., and the relationship during use They do not have to match. For example, even if a component and a finished product are mounted so that the top surface of the component is located on the side surface of the finished product, the top surface for the component does not change.

In addition, in the present specification or the scope of claims, when there are a plurality of items corresponding to a certain component, and each of them is separately expressed, "first" and "second" are added to the beginning of the component. can be distinguished by adding

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings. However, although the shown form embodies the technical idea of the present invention, it does not limit the present invention. Also, in the following description, the same names and symbols indicate the same or homogeneous members, and redundant description may be omitted as appropriate. Note that the sizes and positional relationships of members shown in each drawing may be exaggerated for the convenience of understanding.

<Embodiment>
A light-emitting module 1000 according to an embodiment will be described. 1 to 4 are plan views showing an exemplary form of a light emitting module 1000. FIG. FIG. 1 omits the rotation detection unit 60 . Moreover, FIG. 1 exemplifies a part of the light beam with a dotted line. FIG. 2 is a perspective view of the phosphor wheel device 200 and the rotation detection unit 60. FIG. FIG. 3A is a plan view of the phosphor wheel 100 viewed from the light output surface side. FIG. 3A shows the shaft 41 of the support member 40 and the light receiving section 62 of the rotation detection unit 60 together. 3B and 3C are graphs showing an example of temporal changes in the amount of received light in the rotation detection unit 60. FIG. FIG. 4 is a cross-sectional view of phosphor wheel 100 taken along line IV-IV of FIG. 3A.

The light emitting module 1000 comprises multiple components. The multiple components include one or more first light emitting devices 410 , phosphor wheel device 200 and rotation detection unit 60 . The light-emitting module 1000 emits to the outside light whose wavelength is converted based on light emitted from one or more first light-emitting devices 410 . Light emitting module 1000 is housed in housing 600 .

The multiple components may include one or more optical members. The one or more optical members include, for example, condensing lenses, collimating lenses and mirrors. In addition, you may have an optical member other than these. Also, some or all of these optical members may not be provided. A light-emitting module 1000 illustrated in FIG. 1 has a plurality of first light-emitting devices 410 and a plurality of optical members for controlling light emitted from the plurality of first light-emitting devices 410 . The multiple optical members include a first condensing lens 511 , a first collimating lens 512 and a first mirror 513 .

The light emitting module 1000 can be configured with one or more second light emitting devices 420 . The light emitting module 1000 can further comprise one or more third light emitting devices 430 . The light-emitting module 1000 illustrated in FIG. 1 has a plurality of second light-emitting devices 420 and a plurality of third light-emitting devices 430 . A second condenser lens 521, a second collimating lens 522, and a second mirror 523 are provided as a plurality of optical members for controlling light emitted from the plurality of second light emitting devices 420, and a plurality of third light emitting devices 420 are provided. A third condenser lens 531 , a diffusion member 300 , a third collimator lens 532 and a third mirror 533 are provided as optical members for controlling the light emitted from 430 .

The light emitting module 1000 illustrated in FIG. 1 converts the wavelength of light emitted from the plurality of first light emitting devices 410 and the plurality of second light emitting devices 420, and emits the wavelength-converted light to the outside. In addition, the light emitting module 1000 emits the light emitted from the plurality of third light emitting devices 430 to the outside without wavelength conversion. The light emitting module 1000 controls these lights to emit them to the outside separately or in combination. Separate light or combined light can be extracted to the outside from, for example, a light extraction port 700 formed in the housing 600 .

Each component mentioned above is demonstrated.
(First light emitting device 410)
The one or more first light emitting devices 410 emit light having a peak wavelength of the first wavelength. Here, a plurality of first light emitting devices 410 are arranged on the same plane and used. The light emitting elements of the first light emitting device 410 emit light of the same color. In addition, you may emit the light of a different color.

A semiconductor laser element is adopted as an example of the light emitting element. Alternatively, an LED, an organic EL, or the like may be employed. For example, the light emitting element can employ light whose emission peak wavelength is within the range of 365 nm to 494 nm. In addition, you may employ|adopt the light which has a peak wavelength outside this range. Also, the range of wavelengths is not limited to visible light. Alternatively, light having a peak wavelength in the wavelength range of ultraviolet light may be used.

The light-emitting element may include a light-emitting element that emits blue light. Further, the light-emitting element may include a light-emitting element that emits violet light. Note that a light-emitting element that emits light of a color other than these may be used.

Here, blue light refers to light having an emission peak wavelength within the range of 430 nm to 494 nm. Violet light refers to light whose emission peak wavelength is in the range of 365 nm to 430 nm. A semiconductor laser device containing a nitride semiconductor is given as a light-emitting device that emits blue or violet light. GaN, InGaN, and AlGaN, for example, can be used as nitride semiconductors.

(Phosphor wheel device 200)
The phosphor wheel device 200 has a phosphor wheel 100 , a support member 40 and a driving section 50 . The phosphor wheel device 200 can output emitted light having a wavelength different from that of the incident light by the wavelength conversion section 20 of the phosphor wheel 100 .

(Phosphor wheel 100)
A phosphor wheel 100 has a substrate 10 . The phosphor wheel 100 further has a wavelength conversion section 20 , a first detection section 31 and a second detection section 32 provided on the substrate 10 . The phosphor wheel 100 has a rotation axis A1 and is used while rotating around the rotation axis A1. One side of the phosphor wheel 100 is the light input side, and the opposite side of the input side is the light output side.

(Substrate 10)
The substrate 10 is a plate-like member. The shape of the substrate 10 is, for example, a disk shape. In the phosphor wheel 100, as shown in FIG. 2, the substrate 10 is a disk-shaped translucent substrate. A sapphire substrate, for example, can be used as the translucent substrate.

(First detector 31 and second detector 32)
As shown in FIG. 3A, the detection section 30 is a region that blocks or reflects the emitted light. The detector 30 includes a first detector 31 and a second detector 32 . Moreover, the detection unit 30 may further include a third detection unit. The detection unit 30 only needs to be able to block or reflect light of a specific wavelength among the emitted light. The detector 30 can be made of the same material as the wavelength converter 20 . For example, the detection unit 30 made of a YAG phosphor can be used for the infrared light irradiated to the detection unit 30 . The first detection unit 31 and the second detection unit 32 are provided on the surface of the translucent substrate 10, for example.

(Wavelength converter 20)
The wavelength conversion section 20 includes one or more phosphors that convert the wavelength of light. Phosphors have the property of absorbing light within a specific range of wavelengths as excitation light and emitting light of a wavelength different from the absorbed light as fluorescence. Garnet-based phosphors such as YAG and LAG can be used as phosphors that use blue light as excitation light.

The wavelength conversion unit 20 wavelength-converts light within a wavelength range that serves as excitation light for the phosphor and emits the converted light. However, even within the wavelength range of excitation light, some light may be transmitted without being wavelength-converted. Therefore, the light emitted from the wavelength conversion section 20 may include incident light that passes through the wavelength conversion section 20 .

The wavelength converting portion 20 can be, for example, an annular ring or a polygonal ring. Also, the wavelength conversion section 20 can be configured to have a plurality of wavelength conversion regions. In the phosphor wheel 100 exemplified in FIG. 3A, the first wavelength conversion area 21A and the second wavelength conversion area 22A are formed in annular areas that do not overlap each other. The first wavelength conversion region 21A is provided outside the second wavelength conversion region 22A. The first wavelength conversion region 21A and the second wavelength conversion region 22A contain phosphors of different types. In addition, the same kind of phosphor may be included. For example, the first wavelength converting region 21A can contain LAG phosphor and the second wavelength converting region 22A can contain YAG phosphor.

The wavelength conversion section 20 , the first detection section 31 and the second detection section 32 are provided on the substrate 10 . When the phosphor wheel 100 rotates around the rotation axis A1, the wavelength conversion section 20, the first detection section 31, and the second detection section 32 draw a circumference around the rotation axis A1.

As shown in FIG. 3A, coordinate axes with a radius R are described with the rotation axis A1 as the origin. The first wavelength conversion region 21A is arranged so as to pass through a first circumference centered on the rotation axis A1 and having a radius of a first value R1. In addition, the second wavelength conversion region 22A may use the value of the radius of the circumference passing through the second wavelength conversion region 22A around the rotation axis A1 as the first value R1. The value of the radius of the circumference passing through the second wavelength conversion region 22A is smaller than the value of the radius of the circumference passing through the first wavelength conversion region 21A. The first detection portion 31 and the second detection portion 32 are arranged so as to pass through a second circumference centered on the rotation axis A1 and having a radius of a second value R2 different from the first value R1. Here, among the circles through which at least one of the first detection unit 31 and the second detection unit 32 passes, the radius of the circumference that is the minimum radius is defined as a third value R3, and the radius of the circumference that is the maximum radius is defined as A fourth value is R4. The second value R2 is greater than or equal to the third value R3 and less than or equal to the fourth value R4.

In the phosphor wheel 100 illustrated in FIG. 3A, the wavelength conversion section 20 is provided in an annular shape around the rotation axis A1. The first detection unit 31 and the second detection unit 32 have different widths in the rotation direction of the phosphor wheel 100 and have the same width in the radial direction. It is provided integrally with the portion 20 .

As an example, the first detection section 31 and the second detection section 32 are formed in connection with the second wavelength conversion region 22A. The first detector 31, the second detector 32, and the second wavelength conversion region 22A can be integrally formed. In addition, you may form separately.

The first detection section 31 and the second detection section 32 are arranged along the rotation direction of the phosphor wheel 100 and formed to have different shapes. The first detection section 31 and the second detection section 32 have different lengths in the rotation direction. Here, as an example, the first detector 31 and the second detector 32 are formed on the inner peripheral side of the second wavelength conversion region 22A. Also, the first detection section 31 and the second detection section 32 are separated in the rotation direction and formed to have different lengths in the rotation direction.

As exemplified in FIG. 4, the phosphor wheel 100 can be configured by making the substrate 10 translucent and having filter layers 11 on both sides of the substrate 10 . The phosphor wheel 100 receives incident lights L01 and L02 from its input surface and emits output lights L1 and L2 from its output surface. The properties of the filter layer 11 are set so as to transmit incident light and reflect light after wavelength conversion by the wavelength conversion section 20 . The filter layer 11 is, for example, a dielectric multilayer film. The wavelength conversion part 20 is arranged on the filter layer 11 on the output surface side of the phosphor wheel 100 . The input surface of the phosphor wheel 100 is the surface on which the wavelength converting section 20 is not arranged. By arranging in this way, the incident lights L01 and L02 can be prevented from being reflected by the filter layer 11 and can be transmitted through the translucent substrate 10 to reach the wavelength converting section 20 . Even if part of the light after wavelength conversion by the wavelength conversion unit 20 is emitted toward the substrate 10 side, it can be reflected by the filter layer 11 to the output surface side and extracted.

Also, the top and side surfaces of the wavelength conversion unit 20 and the side surfaces of the phosphor wheel 100 may be covered with the coating layer 12 . The coating layer 12 increases the fixing strength of the wavelength conversion section 20 to the filter layer 11 and the substrate 10 . The covering layer 12 is made of a translucent material.

(Support member 40)
The support member 40 has a mandrel 41 and a support plate 42 . The support plate 42 supports the mandrel 41 in a fixed orientation and position. The support member 40 rotatably supports the phosphor wheel 100 .

(Driving unit 50)
The driving section 50 generates torque around the rotation axis. The speed and direction of rotation can be controlled externally. The drive unit 50 is, for example, an electric motor that operates when electric power is supplied. In the phosphor wheel device 200 illustrated in FIG. 2 , the rotating shaft of the drive section 50 overlaps the axle 41 of the support member 40 .

(Rotation detection unit 60)
The rotation detection unit 60 detects the rotation speed and direction of the phosphor wheel 100 . The rotation detection unit 60 has, for example, a light emitting section 61 and a light receiving section 62 . The light emitting unit 61 has a light emitting element and emits light of a predetermined wavelength for detection (hereinafter referred to as detection light). The light receiving unit 62 receives the detection light from the light emitting unit 61 with a light receiving element and outputs a signal corresponding to the amount of received light. The rotation detection unit 60 irradiates detection light onto a position through which the detection section 30 of the rotating phosphor wheel 100 passes. The light emitting unit 61 and the light receiving unit 62 are arranged to face each other with the phosphor wheel 100 interposed therebetween, as shown in FIG. 2, for example. By arranging in this way, the light receiving section 62 can detect the detection light emitted from the light emitting section 61 and transmitted through the phosphor wheel 100 .

Light emitted from the light emitting unit 61 is incident on the phosphor wheel 100 . When the phosphor wheel 100 rotates around the rotation axis A1, the trajectory of the light emitted from the light emitting unit 61 on the phosphor wheel 100 changes to a fifth circle centered on the rotation axis A1 and having a fifth radius R5. draw a circle A first detection unit 31 and a second detection unit 32 are provided on the trajectory of this light. Therefore, the fifth value R5 is in the range from the third value R3 to the fourth value R4. The first detection section 31 and the second detection section 32 are arranged so that the lengths of passages on the fifth circle are different. Here, different lengths include the case where one length is 0. The fifth value R5 may be within the range of the third value R3 or more and the fourth value R4 or less, and may be the same value as the second value R2.

The phosphor wheel device 200 uses a rotation detection unit 60 to detect the speed and direction of rotation of the phosphor wheel 100 . The rotation detection unit 60 irradiates the rotating phosphor wheel 100 with the light emitted by the light emitting section 61 , and the light receiving section 62 receives the transmitted light or reflected light. The rotation speed and direction of the phosphor wheel 100 can be detected from the change in the amount of light received by the light receiving unit 62 over time.

In the rotation detection unit 60 shown in FIG. 2, the transmittance of the first detection section 31 and the second detection section 32 with respect to the wavelength of light emitted from the light emitting section 61 is the same as that of other regions on the same circumference. less than the rate. Therefore, when the phosphor wheel 100 rotates, the amount of light received by the light receiving section 62 decreases when the first detection section 31 and the second detection section 32 pass, and increases when they do not pass.

3A to 3C, the temporal change in the amount of light received by the light receiving section 62 will be described. In the phosphor wheel 100 illustrated in FIG. 3A , the rotation detection unit 60 changes the detection state twice per rotation (one cycle T) of the phosphor wheel 100 . One time is a change in detection state due to passage through the first detection section 31 , and the remaining one time is a change in detection state due to passage through the second detection section 32 . Since the first detection unit 31 and the second detection unit 32 have different widths in the rotation direction of the phosphor wheel 100 on the same circumference, each detection state is maintained in the phosphor wheel 100 rotating at a constant speed. different lengths of time. Note that the first detection unit 31 and the second detection unit 32 may be collectively described as the detection unit 30 in some cases.

3B and 3C are examples of changes over time in the signal output from the rotation detection unit 60 when the phosphor wheel 100 rotates at a constant speed, and correspond to changes over time in the amount of light received by the light receiving section 62. ing. When the amount of light received by the light receiving section 62 is relatively large, it corresponds to the H level of the signal, and when it is relatively small, it corresponds to the L level of the signal. That is, the L level is the state in which the detection light is incident on the detection section 30 and the H level is the state in which the detection light is not incident on the detection section 30 . FIG. 3C shows a detection state when the direction of rotation of the phosphor wheel 100 is reversed with respect to the detection state of FIG. 3B.

In both FIGS. 3B and 3C, the L level state is detected twice during one rotation of the phosphor wheel 100 (during one cycle T). The second L level detection state is detected when T ₁ time has passed since the first L level detection state was detected. In the case of FIG. 3B, the time (T2 hours) from the end of the _second L level detection state to the detection of the _first L level detection state in the next cycle is longer than T1 time. too long. It should be noted that the difference between the T1 time and the T2 _time should be sufficient to clearly detect the difference, and the T2 _time may be shorter _than the _T1 time.

In FIG. 3B, the time for which the L level detection state is maintained for the second time is longer than the time for which the L level detection state is maintained for the first time. On the other hand, in FIG. 3C, the time during which the low level detection state is maintained for the second time is shorter than the time during which the low level detection state is maintained for the first time. In this way, the phosphor wheel 100 can detect the direction of rotation from the order of length of the detection state of the L level. It should be noted that the direction of rotation can also be detected from the order of length of the detection state of H level.

In light-emitting module 1000, one or more first light-emitting devices 410 emit light having a first wavelength as a peak wavelength. The emitted light is applied to the wavelength conversion section 20 of the phosphor wheel device 200 . The irradiated light is wavelength-converted by the wavelength conversion unit 20, and the phosphor wheel device 200 outputs the first light. The rotation detection unit 60 detects the rotation speed and rotation direction of the phosphor wheel 100 . Therefore, it is possible to monitor the rotation speed and the rotation direction of the phosphor wheel 100, and it is possible to know that a malfunction has occurred with respect to the assumed normal operation.

The light emitting module 1000 may include one or more second light emitting devices 420 that emit light having a peak wavelength of a second wavelength different from the first wavelength. The emitted light is applied to the wavelength conversion section 20 of the phosphor wheel device 200 . The irradiated light is wavelength-converted by the wavelength conversion unit 20, and the phosphor wheel device 200 outputs the second light. However, the wavelength conversion unit 20 includes a first wavelength conversion region 21A irradiated with light emitted from one or more first light emitting devices 410 and a light emitted from one or more second light emitting devices 420. and a second wavelength conversion region 22A. Therefore, the light emitted from one or more first light emitting devices 410 and the light emitted from one or more second light emitting devices 420 can be wavelength-converted separately.

(optical member)
An optical member is a member that controls and emits incident light by refracting or reflecting the light. An optical member is, for example, a condensing lens, a diffusing member, a collimating lens, or a mirror.

(Condenser lens)
The first condenser lens 511, the second condenser lens 521, and the third condenser lens 531 collect and emit incident light. Each of these condensing lenses may be formed of a single lens or a plurality of compound lenses.
(Diffusion member)
The diffusion member 300 diffuses and emits incident light. The diffusion member 300 diffuses light focused in a specific direction to make the light uniform. The diffusion member 300 can be formed by containing a diffusion material in a base material. Moreover, the diffusion member 300 can be formed by providing unevenness on the front surface and the back surface. Diffusion member 300 homogenizes the light, making it suitable for its intended purpose.
(collimating lens)
The first collimating lens 512, the second collimating lens 522, and the third collimating lens 532 collimate the incident light and emit it. Each collimating lens may be a single lens or a compound lens.
(mirror)
The first mirror 513, the second mirror 523, and the third mirror 533 reflect part of the incident light and transmit part of it. Each mirror can use, for example, a dichroic mirror.

The optical member is arranged in the optical path from each light emitting device to the light extraction port 700 .
The first condenser lens 511 is installed at a position where the light emitted from the first light emitting device 410 is condensed and emitted toward the first wavelength conversion region 21A. The second condenser lens 521 is installed at a position where the light emitted from the second light emitting device 420 is condensed and emitted toward the second wavelength conversion region 22A. The third condenser lens 531 is installed at a position where the light emitted from the third light emitting device 430 is condensed and emitted toward the diffusion member 300 .
The light diffused by the diffusion member 300 is emitted to the third collimator lens 532 .

The first collimator lens 512 is installed at a position where the light wavelength-converted by the first wavelength conversion region 21A is emitted toward the first mirror 513 as parallel light. The second collimator lens 522 is installed at a position where the light wavelength-converted by the second wavelength conversion region 22A is emitted toward the second mirror 523 as parallel light. The third collimator lens 532 is installed at a position where the light diffused by the diffusion member 300 is emitted toward the third mirror 533 as parallel light.
The first mirror 513 is arranged at a position where it reflects the first light that has been wavelength-converted and turned into parallel light. The second mirror 523 is arranged at a position where it reflects the second light, which has been wavelength-converted and becomes parallel light, and transmits the first light. The third mirror 533 is arranged at a position that reflects the third diffused parallel light and transmits the first light and the second light.

(Second light emitting device 420, third light emitting device 430)
The description of the first light emitting device 410 already described is common to the second light emitting device 420 and the third light emitting device 430 .
When light-emitting module 1000 includes one or more first light-emitting devices 410 and one or more second light-emitting devices 420, one or more first light-emitting devices 410 include a plurality of first semiconductor laser elements. In addition, the one or more second light emitting devices 420 can comprise a plurality of second semiconductor laser elements. The first semiconductor laser element and the second semiconductor laser element may be the same or different.

If the light-emitting module 1000 further includes one or more third light-emitting devices 430, the one or more third light-emitting devices 430 can include a plurality of third semiconductor laser elements. The first semiconductor laser element, the second semiconductor laser element, and the third semiconductor laser element may be the same, or may be different from each other.

Next, the light-emitting module 1000 exemplified in FIG. 1 will be described, focusing on the path of light.
The first light emitting device 410 emits first light having a peak wavelength of the first wavelength. The emitted first light is condensed on the first wavelength conversion region 21A of the phosphor wheel 100 by the first condensing lens 511 . The condensed light is wavelength-converted by the phosphor in the first wavelength conversion region 21A, and the wavelength-converted first light is emitted from the phosphor wheel device 200. FIG. Further, the wavelength-converted first light becomes parallel light L1P by the first collimating lens 512 . The parallel light L1P is L1P2 that is reflected by the first mirror 513 and travels in the direction of the light extraction port 700 .

The phosphor wheel 100 is arranged at a position closer to the first collimating lens 512 than the first condensing lens 511 . The phosphor wheel 100 is preferably positioned near the first collimating lens 512 . Since the wavelength-converted light is emitted from the wavelength conversion section 20 over a wide angle range, the wavelength conversion section 20 can be brought closer to the first collimator lens 512 to reduce the loss of light. In addition, when collimating the same amount of light, the area of the lens surface of the first collimator lens 512 can be designed to be small.

The second light emitting device 420 emits second light having a peak wavelength of the second wavelength. The emitted second light is focused on the second wavelength conversion region 22A of the phosphor wheel 100 by the second condenser lens 521 . The condensed light is wavelength-converted by the phosphor in the second wavelength conversion region 22A, and the wavelength-converted second light is emitted from the phosphor wheel device 200. FIG. Furthermore, the wavelength-converted second light becomes parallel light L2P by the second collimating lens 522 . The parallel light L2P is L2P2 that is reflected by the second mirror 523 and travels in the direction of the light extraction port 700 .

The third light emitting device 430 emits third light having a peak wavelength of the third wavelength. The emitted third light is condensed on the diffusion member 300 by the third condensing lens 531 . The diffusion member 300 diffuses and emits the condensed light. The diffused third light becomes parallel light L3P by the third collimating lens 532 . The parallel light L3P is L3P2 that is reflected by the third mirror 533 and travels in the direction of the light extraction port 700 .
Each component of the light emitting module 1000 illustrated in FIG. 1 is arranged so that the optical axes of the lights L1P2, L2P2, and L3P2 traveling in the direction of the light extraction port 700 are aligned. Therefore, the parallel lights L1P, L2P, and L3P can be extracted from the light extraction port 700 as separate lights or combined lights passing through the same axis.

In FIG. 1, the light outlet 700 is explained as one place, but for example, as shown in the light emitting module 1000A of FIG. A third light outlet 730 may be provided to separately extract the individual light and the combined light. For example, the first mirror 513A reflects 50% of the first light L1P that has been wavelength-converted and becomes parallel light, and transmits 50% of the first light L1P. It can be taken out from one light extraction port 710 . Similarly, the second mirror 523A reflects 50% of the second light L2P that has been wavelength-converted and becomes parallel light, and transmits 50% of the light L2P1 that has passed through the second mirror 523A. It can be taken out from the second light extraction port 720 . In addition, the third mirror 533A reflects 50% of the third light L3P, which is diffused and becomes parallel light, and transmits 50% of the light L3P1. It can be taken out from the light extraction port 730 . Also, separate light or combined light can be extracted from the light outlet 700 .
Furthermore, in FIGS. 1 and 10, a configuration may be adopted in which a heat sink for removing heat is installed behind the first light emitting device 410, the second light emitting device 420, and the third light emitting device 430. FIG.

Next, modified examples 1 to 5 in each configuration will be described with reference to FIGS. 5A to 9C.
(Modification 1)
In the phosphor wheel 101 shown in FIG. 5A, the wavelength conversion section 20 is annularly provided around the rotation axis A1. The first detection unit 31A and the second detection unit 32A are arranged along the ring-shaped wavelength conversion unit 20 so that the width in the radial direction of the phosphor wheel 101 is different and the width in the rotation direction is the same. 20 are provided integrally.
5B and 5C are examples of temporal changes in the signal output by the rotation detection unit 60 when the phosphor wheel 101 rotates at a constant speed. In FIGS. 3B and 3C, the difference in the time when the L level is detected is used, but in FIGS. 5B and 5C, the difference in the amount detected by the light receiving section 62 is used. That is, the amount of light received by the light receiving unit 62 when the detection light passes through the first detection unit 31A and the amount of light received by the light receiving unit 62 when the detection light passes through the second detection unit 32A The amount of received light is made different from that of the received light. For example, one of the first detection section 31A and the second detection section 32A is at the M1 level, and the other is at the L level, which is lower than the M1 level. This is because the second detection section 32A, which has a larger width in the radial direction than the first detection section 31A, blocks more light. For example, with respect to the area irradiated with the detection light, only a partial area of the detection light is blocked in the first detection section 31A, and all of the detection light is blocked in the second detection section 32A.

(Modification 2)
In the phosphor wheel 102 shown in FIG. 6A, the wavelength conversion section 20 is provided in an annular shape around the rotation axis A1. At least one of the first detection section 31B and the second detection section 32B does not have a constant width in the radial direction in the rotating direction of the phosphor wheel 102 . Here, the width in the rotation direction is not constant means that the center angle around the rotation axis A1 at both ends in the rotation direction is not constant. The central angle of the second detection portion 32B of the phosphor wheel 102 increases as the radius increases, and the width in the direction of rotation increases as the radius increases.
The first detection section 31B and the second detection section 32B are formed integrally with the wavelength conversion section 20 along the annular wavelength conversion section 20 . The first detection portion 31B and the second detection portion 32B have the same width in the radial direction except for the ends in the rotational direction. Both ends of the second detector 32B in the rotational direction have different inclinations with respect to the radial direction. Also, the first detection section 31B and the second detection section 32B are provided integrally with the wavelength conversion section 20 along the annular wavelength conversion section 20 .

FIGS. 6B and 6C are examples of changes over time in signals output from the rotation detection unit 60 when the phosphor wheels 102 whose rotation directions are opposite to each other rotate at a constant speed. 6B and 6C, similarly to FIGS. 3B and 3C, the direction of rotation can be detected from the detection results.

(Modification 3)
A time-division light source sometimes extracts and uses light of a plurality of wavelengths output from a phosphor wheel device in a time-division manner. In such a case, one or a plurality of phosphors contained in the wavelength conversion section 20 are provided so as to be partitioned in the rotation direction of the ring-shaped wavelength conversion section 20 . A phosphor wheel 103 shown in FIG. 7 is provided with phosphors 21B, 22B, and 23B partitioned in the rotational direction.
The first detection portion 31C and the second detection portion 32C are arranged along the ring-shaped wavelength conversion portion 20 so that the width in the rotation direction of the phosphor wheel 103 is different from that in the radial direction and the width in the radial direction is the same. is integrated with. The change over time of the signal output by the rotation detection unit 60 is the same as in FIGS. 3B and 3C. Note that if the first detection section 31C and the second detection section 32C have different light absorption rates at the wavelength of the light emitted from the light emitting section 61 of the rotation detection unit 60, the same results as in FIGS. 5B and 5C can be obtained. .

(Modification 4)
Similar to the phosphor wheel 103, the phosphor wheel 104 shown in FIG. 8A has phosphors 21B, 22B, and 23B separated in the rotational direction. The first detection section 31D, the second detection section 32D, and the third detection section 33D are provided integrally with the wavelength conversion section 20 along the annular wavelength conversion section 20, have the same width in the radial direction, and rotate. The width in the direction is also the same. On the other hand, the first detection section 31D, the second detection section 32D, and the third detection section 33D have different optical absorptances with respect to the detected light.
8B and 8C are examples of changes over time in signals output by the rotation detection unit 60 when the phosphor wheel 104 rotates at a constant speed. As shown in FIGS. 8B and 8C, which of the first detection section 31D, the second detection section 32D, and the third detection section 33D the detected light passes through can be identified from the difference in level of the detection state. In FIG. 8B rotated by D1 rotation, different levels of L, M3 and M2 appear in order, and in FIG. 8C rotated in D2 rotation L, M2 and M3 appear in order. Thus, the direction of rotation can be detected from the order in which the levels of L, M2, and M3 are detected.

(Modification 5)
The rotation detection unit 60 may detect rotation using reflected light. In the example shown in FIG. 9A, the rotating phosphor wheel 105 is irradiated with light emitted by the light emitting unit 61, and the light receiving unit 62 receives the reflected light. Therefore, the first detection section 31E and the second detection section 32E have light-reflective surfaces, and the light-emitting section 61 and the light-receiving section 62 of the rotation detection unit 60 are arranged on the same side of the phosphor wheel 105 .
9B and 9C are examples of temporal changes in signals output from the rotation detection unit 60 when the phosphor wheel 105 rotates at a constant speed. In the case of FIGS. 3B and 3C, the amount of received light is L level when the detection light passes through the detector 30, and the amount of received light is at H level when the detection light does not pass through the detector 30. However, in the case of FIGS. 9B and 9C, the amount of received light is at H level when the detection light passes through the detection section 30, and the amount of reception is at L level when the detection light does not pass through the detection section 30. becomes. Also in this case, the direction of rotation can be detected based on the same principle.

The first detection section and the second detection section may include one or more phosphors contained in one or more phosphors of the wavelength conversion section.
In embodiments and modifications, the detectors may be integrally formed of the same material as the wavelength converters adjacent to each other along the annular wavelength converters. That is, the detection section may be provided inside or outside the annular wavelength conversion section like a projection of the wavelength conversion section.

For example, in the phosphor wheel 100 of the embodiment, the first detection unit 31 and the second detection unit 32 are made of the same material as the second wavelength conversion region 22A of the wavelength conversion unit 20, and are like the projections of the second wavelength conversion region 22A. can be formed. In this way, the first detection section 31 and the second detection section 32 can be formed without increasing the types of materials of the phosphor wheel 100 . Then, for example, when the wavelength conversion section 20 is formed by screen printing or the like using a mask, the first detection section 31 and the second detection section 32 can be formed simultaneously without increasing the number of steps.
The detection unit 30 may be formed separately from the same material as the wavelength conversion unit 20, or may be formed integrally from the wavelength conversion unit 20 using a different material.

Further, the first detection section and the second detection section may include the first phosphor and the second detection section may include a second phosphor different from the first phosphor. By making the phosphors different in this way, it is also possible to make the light absorptances of the first detection section and the second detection section different. Therefore, the direction of rotation can be detected from the order of detection states with different levels, in addition to the order of long and short detection states, without increasing the material of the phosphor wheel.

In the explanation so far, it is assumed that the first wavelength and the second wavelength are different. However, the first wavelength and the second wavelength may be the same. For example, the first light emitting device 410 and the second light emitting device 420 may emit blue light, and the third light emitting device 430 may emit violet light. In this case, a semiconductor laser element that emits blue light is used as the light emitting element of the first light emitting device 410 and the second light emitting device 420, and a semiconductor laser element that emits violet light is used as the light emitting element of the third light emitting device 430. can be adopted.

Although the embodiments according to the present invention have been described above, the phosphor wheel device and the light emitting module according to the present invention are not strictly limited to the embodiments. In other words, the present invention cannot be realized unless it is limited to the outer shape and structure of the phosphor wheel device and the light emitting module disclosed by the embodiments. Moreover, it can be applied without making it essential to have all the components necessary and sufficient. For example, if some of the constituent elements of the light-emitting module disclosed by the embodiments are not described in the claims, the partial constituent elements may be replaced, omitted, modified in shape, or changed in material. It recognizes the freedom of design by those skilled in the art such as, and specifies that the invention described in the scope of claims is applied.

REFERENCE SIGNS LIST 10 substrate 20 wavelength conversion section 21A first wavelength conversion region 22A second wavelength conversion region 30 detection section 31 first detection section 32 second detection section 40 support member 41 mandrel 42 support plate 50 drive section 60 rotation detection unit 61 light emission section 62 Light receiving unit 100 phosphor wheel 200 phosphor wheel device 300 diffusion member 410 first light emitting device 511 first condenser lens 512 first collimator lens 513 first mirror 600 housing 700 light outlet 710 first light outlet 1000 light emitting module

Claims (13)

Fluorescent light having a substrate, a wavelength conversion unit provided on the substrate including one or more phosphors for converting the wavelength of light, and a first detection unit and a second detection unit provided on the substrate a body wheel;
a support member that rotatably supports the phosphor wheel;
a driving unit that rotates the phosphor wheel about the rotation axis of the phosphor wheel;
with
The wavelength conversion unit is arranged so as to pass through a first circumference centered on the rotation axis and having a first radius,
The first detection unit and the second detection unit are arranged so as to pass through a second circumference centered on the rotation axis and having a radius that is a second value different from the first value,
The first detection unit and the second detection unit set, as a third value, a value of a minimum radius of a circumference about the rotation axis through which at least one of the first detection unit and the second detection unit passes, and the rotation When the maximum radius of the circumference around the axis through which at least one of the first detection section and the second detection section passes is a fourth value, the fourth On the circumference that is a fifth value in the range of the value of or less, the length of the first detection unit passing on the circumference, the length of the second detection unit passing on the circumference, are arranged differently. 2. The phosphor wheel device according to claim 1, wherein the first detection section and the second detection section have different widths in the rotation direction of the phosphor wheel on the same circumference. The wavelength conversion unit is provided in an annular shape on the substrate,
The first detection section and the second detection section have the same width in the radial direction of the phosphor wheel, and are provided integrally with or separately from the wavelength conversion section along the annular wavelength conversion section. The phosphor wheel device according to claim 2. 2. The phosphor wheel device according to claim 1, wherein the first detection section and the second detection section have different widths in the radial direction of the phosphor wheel. The wavelength conversion unit is provided in an annular shape on the substrate,
The first detection section and the second detection section have the same width in the rotation direction of the phosphor wheel on the same circumference, and are integrated with or integrated with the wavelength conversion section along the annular wavelength conversion section. 5. The phosphor wheel device according to claim 4, which is provided separately. 2. The phosphor wheel device according to claim 1, wherein the width of at least one of the first detection section and the second detection section in the rotation direction of the phosphor wheel is not constant in the radial direction of the phosphor wheel. The phosphor wheel device according to any one of claims 1 to 6, wherein the first detection section and the second detection section include one or more phosphors contained in the one or more phosphors. The first detection unit includes a first phosphor,
The phosphor wheel device according to any one of claims 1 to 7, wherein the second detector includes a second phosphor different from the first phosphor. 9. The phosphor wheel device according to claim 1, wherein the first detection section and the second detection section are provided on the surface of the translucent substrate. a phosphor wheel device according to any one of claims 1 to 9;
one or a plurality of first light emitting devices that emit light having a first wavelength as a peak wavelength to the wavelength conversion unit;
a rotation detection unit having a light emitting section that emits detection light to a position through which the first detection section and the second detection section pass by rotation of the phosphor wheel, and a light receiving section that receives the detection light;
A light-emitting module comprising: further comprising one or a plurality of second light emitting devices that emit light having a peak wavelength of a second wavelength different from the first wavelength to the wavelength conversion unit;
The wavelength conversion section includes a first wavelength conversion region irradiated with light emitted from the one or more first light emitting devices and a second wavelength conversion region irradiated with light emitted from the one or more second light emitting devices. 11. The light emitting module according to claim 10, comprising two wavelength conversion regions. 12. The light-emitting module according to claim 11, wherein the first wavelength conversion region and the second wavelength conversion region are annular regions that do not overlap each other. the one or more first light emitting devices include a plurality of first semiconductor laser elements,
13. The light-emitting module according to claim 11, wherein said one or more second light-emitting devices include a plurality of second semiconductor laser elements.

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