JP6940765B2 - Light source device, optical engine and projector - Google Patents

Description

The present invention relates to a light source device having a semiconductor laser, and an optical engine and a projector equipped with this light source device.

In recent years, a light source device having a semiconductor laser or a light emitting diode has been used in various technical fields. Among them, a light source device including a plurality of light emitting diodes and an optical support member for supporting a lens arranged so as to face each light emitting diode has been proposed (see, for example, Patent Document 1).

International Publication 2016/203945

In the light source device described in Patent Document 1, the optical support member is slidably attached to the metal support member, whereby the optical support member slides even if deformation occurs due to an external force or a temperature change. By doing so, it is possible to suppress the occurrence of deformation such as warpage.
However, since the surface of the lens is exposed from the optical support member, for example, when light having a high light density and a short wavelength passes through the lens, the light energy becomes high and dust in the air is adsorbed on the outer surface of the lens. there's a possibility that. In this case, the optical performance of the light source device deteriorates.

Further, in the light source device described in Patent Document 1, since it is necessary to manufacture a plurality of lenses, it takes time and effort to manufacture the lens, and the manufacturing cost also increases. Further, since the optical support member has a structure of supporting the outer periphery of each lens, the inner wall forming the lens accommodating space requires high dimensional accuracy, it takes time and effort to manufacture, and the manufacturing cost also increases.

The present invention has been made in view of the above problems, and provides a light source device capable of suppressing adhesion of dust and the like to a lens with a structure that is easy to manufacture, and an optical engine and a projector provided with this light source device. The purpose.

In order to solve the above problems, the optical device according to one aspect of the present invention is
With multiple semiconductor lasers
A lens array having a plurality of collimating lenses corresponding to the semiconductor laser, and
An enclosing member having a plurality of through holes composed of an inner wall surrounding an optical path of light emitted from each of the collimating lenses.
With
The incident-side end surface of the surrounding member is in contact with the outer edge surface of the lens array over the entire circumference.

The optical engine according to one aspect of the present invention is
With the above light source device
With the housing
With
The light source device and the housing are connected via an elastic sealing member so that the surrounding member is arranged inside the housing.

The projector according to one aspect of the present invention
With the above light source device
A phosphor wheel into which the light emitted from the light source device is incident, and
An optical modulation means for sequentially modulating light in a plurality of wavelength bands emitted from the phosphor wheel based on image data to form an image, and
A projection means for enlarging and projecting the image, and
It has.

As described above, the present invention can provide a light source device capable of suppressing adhesion of dust or the like to a lens with a structure that is easy to manufacture, and an optical engine and a projector provided with this light source device.

It is a schematic side sectional view which shows the outline of the light source apparatus which concerns on one Embodiment of this invention. It is a schematic perspective view which shows an example of the light source device in the state which the surrounding member is not attached. It is a side sectional view schematically showing the internal structure of an example of the light source device in the state where the surrounding member is not attached. FIG. 3 is a side sectional view of the internal structure of the light source device shown in FIG. 3A as viewed from an orthogonal direction. It is a schematic perspective view which shows the outline of the optical engine which concerns on one Embodiment of this invention. FIG. 4 is a cross-sectional view taken along the line VV of FIG. 4 (perspective view). FIG. 5 is a schematic cross-sectional view (perspective view) showing an enlarged area of the light source device of the optical engine shown in FIG. 5A. FIG. 5 is a side sectional view schematically showing an example of an optical engine mounting structure using a spacer and a connecting member in the optical engine shown in FIG. It is a schematic diagram which shows the outline of the projector which concerns on one Embodiment of this invention, and is the schematic plan view which looked at the projector from the top.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each drawing, corresponding members having the same function are designated by the same reference numerals. Although the embodiments may be shown separately for convenience in consideration of the explanation of the main points or the ease of understanding, partial replacement or combination of the configurations shown in the different embodiments is possible. In the embodiment described later, the description of the matters common to the above-described embodiment will be omitted, and only the differences will be described. In particular, similar actions and effects with the same configuration will not be mentioned sequentially for each embodiment.

(Light source device according to one embodiment)
First, the light source device according to one embodiment of the present invention will be described with reference to FIGS. 1, 2, 3A and 3B. Here, FIG. 1 is a schematic side sectional view showing an outline of a light source device according to one embodiment of the present invention. FIG. 2 is a schematic perspective view showing an example of a light source device in a state where the surrounding member is not attached. FIG. 3A is a side sectional view schematically showing an internal structure of an example of a light source device in a state where a surrounding member is not attached. FIG. 3B is a side sectional view of the internal structure of the light source device shown in FIG. 3A as viewed from an orthogonal direction.

As shown in FIG. 1, the light source device 10 according to the present embodiment includes a plurality of semiconductor lasers 4 and a lens array 6 having a plurality of collimating lenses 8 corresponding to the semiconductor lasers 4. The light source device 10 further includes a surrounding member 60 having a plurality of through holes 62 composed of an inner wall 64 that surrounds an optical path of light emitted from each collimating lens 8. The light emitted from the semiconductor laser 4 and traveling through the through hole 62 from the collimating lens 8 is schematically shown by the dotted line in FIG. An example of the outer shape of the lens array 6 is shown in FIG.

Although shown briefly in FIG. 1, as shown in FIG. 3, the light source device 10 includes a package 12 having a side wall portion 12C and a substrate portion 12D. The plurality of semiconductor lasers 4 are mounted on the substrate portion 12D and surrounded by the side wall portion 12C. The end surface 12A on the exit side of the package 12 is in contact with the outer edge surface 6B on the incident side of the lens array 6, and the package 12 and the lens array 6 form an internal space shielded from the outside air. The plurality of semiconductor lasers 4 are housed in the internal space of the package 12.

Further, in the light source device 10 shown in FIG. 3, in order to further enhance the airtightness of the internal space, a main body portion 12E provided with a translucent member 14 is arranged in a region adjacent to the lens array 6. However, even if the main body 12E is not provided, the internal space sufficiently shielded from the outside air can be formed by the contact between the end surface 12A on the exit side of the package 12 and the outer edge surface 6B on the incident side of the lens array 6. can.

In the present embodiment, the end surface 12A on the exit side of the package 12 and the outer edge surface 6B on the incident side of the lens array 6 are bonded with an adhesive. Further, the outer edge surface 6A on the exit side of the lens array 6 and the end surface 60A on the incident side of the surrounding member 60 are joined with an adhesive. The incident-side end face 60A means the entire surface of the incident-side end face, and not only the incident-side outer edge surface 66A of the flange portion 66 of the surrounding member 60, which will be described later, but also the peripheral end faces of each through hole 62 (arrows in FIG. 1). See T).

As the adhesive to be applied, for example, an epoxy-based ultraviolet irradiation-curable type adhesive is preferable, and an acrylic-based ultraviolet irradiation-curable type adhesive is more preferable.
As shown in FIG. 2, the package 12 and the lens array 6 can be further fixed by using the metal fitting 70, and the surrounding member 60 can also be fixed to the package 12 and the lens array 6 by using the metal fitting. can.

A rising mirror 16 corresponding to each semiconductor laser 4 is mounted on the substrate portion 12D of the package 12. The light emitted from the semiconductor laser 4 in a direction substantially parallel to the upper surface of the substrate portion 12D is reflected by the rising mirror 16 in a direction substantially perpendicular to the upper surface of the substrate portion 12D, and is transparent to the main body portion 12E. It passes through the optical member 14 and is incident on the incident surface LA of the lens array 6. The light incident on the incident surface LA becomes parallel light by the lens array 6, and the parallel light is emitted from the exit surface LB of the lens array 6.
Since all of the semiconductor laser 4, the rising mirror 16 and the translucent member 14 are arranged in the internal space formed by the lens array 6 and the package 12 and shielded from the outside air, dust and the like adhere to them. It is possible to suppress deterioration of optical characteristics.

Regarding the wiring to the semiconductor laser 4, the lead 18 extends from the outside to the inside of the package 12 so as to penetrate the side wall portion 12C of the package 12, and is wired by the wire 54 via the relay portion 56. Is electrically connected to each semiconductor laser 4.

In the present embodiment, 20 semiconductor lasers 4 are provided, and 20 rising mirrors 16 corresponding to each semiconductor laser 4 are arranged in a 4 × 5 matrix, and the light reflected by each rising mirror 16 is provided. Each collimating lens 8 of the lens array 6 is arranged so that the center of the lens is located on the optical axis of the lens array 6. The lens array 6 according to the present embodiment is integrally formed by arranging 20 collimating lenses 8 in a 4 × 5 matrix.
However, the present invention is not limited to this, and for example, a lens array in which 10 (2x5) semiconductor lasers and 10 corresponding rising mirrors are mounted and a corresponding 10 collimating lenses are used. Alternatively, a light source device having any number of other semiconductor lasers, rising mirrors, and collimating lenses can be used.

As the semiconductor laser 4, a blue semiconductor laser is used in this embodiment. The emitted light of the blue semiconductor laser is, for example, light having a peak in a specific wavelength in the band of 370 to 500 nanometers, and particularly having a specific wavelength in the wavelength band of 420 to 500 nanometers as a peak. It is preferable that the light is emitted.
However, the present invention is not limited to this, and for example, a nitride semiconductor laser having an oscillation wavelength in an arbitrary wavelength range from ultraviolet to green may be used, or a red or infrared GaAs semiconductor laser semiconductor laser may be used. Is also possible.

In the surrounding member 60 according to the present embodiment, the inner wall 64 is formed of a plate-shaped member formed in a grid pattern, thereby forming a plurality of through holes 62. Since the surrounding member 60 has a simple structure made of plate-shaped members formed in a grid pattern, the surrounding member 60 can be formed at a low manufacturing cost. In particular, when the surrounding member 60 is made of a metal material, it has excellent heat resistance and high thermal conductivity, so that it is also effective for heat dissipation. The light emitted from each collimated lens 8 is parallel light and travels straight in the space surrounded by the inner wall 64. Even if the light hits the inner wall 64, the surrounding member 60 is made of a metal material having high reflectance. Since it is configured, it is possible to suppress the attenuation of light.

If the metal enclosing member 60 is connected so as to be in direct contact with the package 12 of the light source device 10, it can function as a heat sink having the outer surface of the enclosing member 60 as a cooling surface. Further, fins or the like for increasing the cooling area can be attached to the outer surface of the surrounding member 60.

However, the surrounding member is not limited to the above-mentioned plate-shaped member formed in a grid pattern, for example, a metal block having a plurality of through holes corresponding to each collimating lens, or a plurality of circular pipes. There may be a shape that is integrally connected.

As described above, the surrounding member 60 according to the present embodiment has a plurality of through holes 62 composed of an inner wall 64 that surrounds the optical path of the light emitted from each collimating lens 8. Therefore, the outside air reaches the collimating lens 8 only after flowing from the end surface 60B on the exit side of the surrounding member 60 into the through hole 62 surrounded by the inner wall 64. Therefore, the outside air does not directly hit the surface of the collimating lens 8.

When light of a short wavelength having a high light density is transmitted from the semiconductor laser 4 through the lens, the light energy becomes high and dust or the like in the air may be adsorbed on the outer surface of the lens (so-called photodust collection effect). However, in the present embodiment, the structure provided with the surrounding member 60 can effectively prevent dust and the like from adhering to the lens array 6 due to the so-called light dust collecting effect. In particular, since one surrounding member 60 having a plurality of through holes 62 may be attached, the manufacturing cost and the assembling man-hours can be reduced as compared with the case where each collimating lens 8 is covered with a cylindrical member.
As described above, it is possible to provide a light source device capable of suppressing the adhesion of dust and the like to the collimating lens with a structure that is easy to manufacture.

If the incident-side end surface 60A of the enclosing member 60 is in contact with the outer edge surface 6A of the lens array 6 over the entire circumference, it is necessarily enclosed by the incident-side end of each through hole 62 (see arrow T in FIG. 1). The member 60 and the lens array 6 may not be in contact with each other. Even if there is a slight gap with the lens array 6 at the incident-side end of each through hole 62, it is possible to suppress the adhesion of dust and the like. In this case, the dimensional accuracy of the surrounding member 60 and the lens array 6 can be relaxed to reduce the manufacturing cost, and the surrounding member 60 can be easily attached.

Of course, it seems that the peripheral region of each through hole 62 of the incident side end surface 60A of the surrounding member 60 (see arrow T in FIG. 1) is in contact with the exit side surface of the lens array 6 (see arrow S in FIG. 1). It can also be formed into. In this case, it is possible to more effectively suppress the adhesion of dust and the like to the lens array.

As shown in FIG. 1, the length of the through hole 62 of the surrounding member 60 in the traveling direction of light is L, the length of one side in the direction substantially orthogonal to the traveling direction of light in the through hole 62, or a value corresponding to one side. Alternatively, assuming that the diameter or the value corresponding to the diameter is D, the following relationship regarding L and D was found based on the actual dustproof performance.
It is preferable to have a relationship of D ≤ L, more preferably to have a relationship of 2D ≤ L, and even more preferably to have a relationship of 3D ≤ L.

Here, when the through hole 62 has a substantially square cross-sectional shape, one side of the square corresponds to D. When the through hole 62 has a substantially rectangular or other polygonal cross-sectional shape, the cross-sectional area is calculated to obtain the length of one side when a square having this cross-sectional area is obtained, and the value is set to one side. It can be the corresponding value D. When the through hole 62 has a circular cross-sectional shape, the diameter of the circle corresponds to D. When the through hole 62 has another shape surrounded by a curve such as an ellipse, the cross-sectional area is calculated to obtain the diameter when a circle having this cross-sectional area is obtained, and the value corresponds to the diameter. It can be a value D to be used.

When D and L have the above relational expression, it is possible to effectively prevent dust and the like contained in the outside air from reaching the surface of the collimating lens 8.
It should be noted that when the size of L is larger than that of D, dust and the like tend to be less likely to adhere to the collimating lens 8. However, when the size of L is extremely large, the manufacturing cost increases and it is difficult to reduce the size. There is also the possibility of becoming. Therefore, it is preferable to determine the optimum L dimension in consideration of the above-mentioned contradictory events depending on the application and usage environment.

In the present embodiment, the package 12, the lens array 6, and the surrounding member 60 are each joined with an adhesive, but the present invention is not limited to this, and the tightening force of the connecting member (for example, screws, bolts and nuts) can be used. The package 12, the lens array 6, and the surrounding member 60 can also be fixed. In that case, a sealing member is provided between the surrounding member 60 and the lens array 6 and between the lens array 6 and the package 12, and the sealing member is compressed by the tightening force of the connecting member to compress each member in an airtight state. Can be joined. In this case, even if the adhesive layer connecting the members is peeled off, the risk of the lens array 6 and the surrounding member 60 falling off can be avoided.

(Optical engine according to one embodiment)
Next, an outline of the optical engine according to one embodiment of the present invention will be described with reference to FIGS. 4, 5A and 5B. Here, FIG. 4 is a schematic perspective view showing an outline of an optical engine according to one embodiment of the present invention. FIG. 5A is a cross-sectional view (perspective view) of the arrow VV of FIG. FIG. 5B is a schematic cross-sectional view (perspective view) showing an enlarged light source device region of the optical engine shown in FIG. 5A.

The optical engine 2 according to the present embodiment includes a housing 30 in addition to the above-mentioned light source device 10. Then, the light source device 10 and the housing 30 are connected via an elastic seal member 20 so that the surrounding member 60 is arranged inside the housing 30.
Since the surrounding member 60 is arranged inside the housing 30, it is possible to more effectively suppress the adhesion of dust and the like to the collimating lens 8.

<Case, seal member>
As shown in FIG. 5B, the optical engine 2 according to the present embodiment is between the housing 30 having an opening 32 through which the light emitted from the lens array 6 passes, and the surrounding member 60 and the housing 30 of the light source device 10. It is provided with an elastic sealing member 20 for connecting the above. The seal member 20 has an opening into which the surrounding member 60 is inserted, and is composed of an outer edge portion made of an elastic material arranged so as to surround the opening.
As the material of the housing 30, any material such as a resin material and a metal material can be adopted. As the material of the seal member 20, any elastic rubber material or resin material can be adopted.

In the present embodiment, the flange portion 66 is formed around the end portion on the incident side of the surrounding member 60. The outer edge surface 66A on the incident side of the flange portion 66 is in contact with the outer edge surface 6A on the exit side of the lens array 6 over the entire circumference. The outer edge surface 66B on the exit side of the flange portion 66 is in contact with the first surface 22 of the seal member 20 over the entire circumference. The second surface 24, which is located on the side opposite to the first surface 22 of the seal member, is in contact with the periphery 34 of the opening on the incident side of the housing 30 over the entire circumference. In such an arrangement, the seal member 20 is arranged between the flange portion 66 of the surrounding member 60 and the housing 30 in a compressed state.

More specifically, the fastening force of the connecting member (details will be described later) presses the outer edge surface 66B of the flange portion 66 of the surrounding member 60 on the exit side against the first surface 22 of the sealing member 20. As a result, the elastic force of the compressed seal member 20 presses the second surface 24 of the seal member 20 against the circumference 34 of the opening of the housing 30. Therefore, it is possible to airtightly connect between the surrounding member 60 and the sealing member 20 and between the sealing member 20 and the housing 30, and as a result, between the surrounding member 60 and the housing 30 via the sealing member 20. Can be airtightly connected.

Inside the housing 30, an optical member that is emitted from the lens array 6 of the light source device 10 and that transmits or reflects light that has passed through the through hole 62 of the surrounding member 60 is housed. For example, when the optical engine 2 is used in a time-divided projector, it is conceivable to arrange an optical member including a condensing lens that condenses light on a phosphor wheel inside the housing 30. At this time, the inside of the housing 30 can be kept shielded from the outside air by the seal member 20 or the like.

Generally, when short-wavelength light with high light density passes through the collimating lens 8, as in the case of using a blue semiconductor laser as a light source, the light energy becomes high, and the so-called light dust collection effect is achieved in the air. Dust and the like may be adsorbed on the outer surface of the lens. In this case, the optical performance of the optical engine may deteriorate. However, in the optical engine 2 according to the present embodiment, the surrounding member 60 and the housing 30 can be airtightly connected by the sealed elastic sealing member 20, so that the lens array 6 can be connected even when the temperature becomes high. It is possible to effectively prevent dust and the like from adhering to the surface.

As described above, in the optical engine 2 according to the present embodiment, the flange portion 66 is formed around the incident side end portion of the surrounding member 60, and the first surface 22 of the seal member 20 is on the exit side of the flange portion 66. The second surface 24, which is in contact with the end surface (outer edge surface 66B) over the entire circumference and is located on the side opposite to the first surface 22 of the seal member 20, is in contact with the circumference 34 of the opening on the incident side of the housing 30 over the entire circumference. , The seal member 20 is arranged between the flange portion 66 and the housing 30 in a compressed state.
As a result, the flange portion 66 of the surrounding member 60 and the housing 30 can be connected in a sealed state by the sealed member 20 having compressed elasticity, so that dust is collected on the lens array 6 due to the so-called light dust collecting effect even at high temperatures. It is possible to effectively suppress the adhesion of such substances.

Temporarily, due to the difference in the linear expansion coefficient between the package 12 and the lens array 6, or the lens array 6 and the surrounding member 60, adhesion between the package 12 and the lens array 6 or between the lens array 6 and the surrounding member 60 due to a temperature change Even if the lens array 6 is peeled off, in the present embodiment, the positions of the lens array 6 and the surrounding member 60 can be reliably held by the elastic force of the compressed seal member 20. That is, in the present embodiment, the elastic force of the seal member 20 can prevent the lens array 6 and the surrounding member 60 from falling off, and can form a dustproof structure.

Further, since only the outer edge surface 66B on the exit side of the flange portion 66 of the enclosing member 60 having the plurality of through holes 62 is sealed by the sealing member 20, the manufacturing cost is increased as compared with sealing the periphery of each through hole 62. The assembly man-hours can be significantly reduced. Further, since it is not necessary to arrange a seal member between the individual through holes 62, more through holes 62 and thus a collimating lens 8 can be arranged in a small area, and a compact and high-performance optical engine 2 is realized. can. As described above, in the present embodiment, it is possible to provide a compact and high-performance optical engine capable of suppressing the adhesion of dust and the like to the collimating lens 8.

As is clear from FIG. 5B, in the present embodiment, the sealing member 20 has a convex portion 28B inside the second surface 24, and the sealing member 20 has an opening 32 of the housing 30 due to the opening inner surface 32A and the convex portion 28B. Is fitted with. Similarly, the first surface 22 of the seal member 20 has a stepped portion 28A that receives the flange portion 66 of the surrounding member 60, and the flange portion 66 and the stepped portion 28A of the surrounding member 60 allow the seal member 20 to be a light source device. It is fitted with 10.
With such a fitting structure, the positioning of the light source device 10 with respect to the housing 30 can be easily and surely performed. Since no compressive force is directly applied to the stepped portion 28A and the convex portion 28B, the fitting structure can be reliably maintained even when the compressive force is applied to the seal member 20.

<Heat sink>
The optical engine 2 according to the present embodiment further includes a heat sink 40. The mounting surface 42 of the heat sink 40 is in contact with the end surface 12B on the side opposite to the exit side of the package 12 of the light source device 10. The heat sink 40 according to the present embodiment is a comb-shaped aluminum heat sink having a plurality of fins 44, and can effectively cool the optical engine 2. However, the heat sink is not limited to this, and any heat sink having any known material and structure can be used.
Further, in the present embodiment, the heat sink 40, the package 12, the lens array 6, the surrounding member 60, the seal member 20, and the housing 30 are fixed by the connecting member connecting the heat sink 40 and the housing 30.

In such a fixed structure, the heat sink 40 and the package 12 are strongly brought into contact with each other by the fastening force of the connecting member connecting the heat sink 40 and the housing 30, to improve the cooling performance, and the seal member 20 is compressed to have a sealing property. And the holding capacity of the lens array 6 and the surrounding member 60 can be enhanced.

<Mounting structure>
Next, with reference to FIG. 6, a mounting structure for fixing the heat sink 40, the package 12, the lens array 6, the surrounding member 60, the seal member 20, and the housing 30 by the above connecting members will be described. FIG. 6 is a side sectional view schematically showing an example of an optical engine mounting structure using a spacer and a connecting member in the optical engine shown in FIG. The step portion 28A of the seal member 20 is omitted.

In a plan view of the heat sink 40 in the exit direction, regions into which the connecting member 52 is inserted are provided at four locations outside the outer shape of the package 12, the lens array 6, the surrounding member 60, and the sealing member 20. In this portion, the fins 44 are not formed, and the fastening surface 46 in which the head portion of the connecting member 52 is in contact is formed. The fastening surface 46 is provided with a through hole into which the shaft portion of the connecting member 52 can be inserted. In the same plan view, a screw hole into which the screw portion of the connecting member 52 is screwed is provided at a position corresponding to the through hole of the housing 30.

In the present embodiment, a hollow cylindrical spacer 50 is arranged between the mounting surface 42 of the heat sink 40 and the periphery 34 of the opening of the housing 30. The shaft portion of the connecting member 52 inserted through the hole provided in the fastening surface 46 of the heat sink 40 passes through the spacer 50 and is screwed into the screw hole provided in the housing 30. As a result, a mounting structure for fixing the heat sink 40, the package 12, the lens array 6, the surrounding member 60, the seal member 20, and the housing 30 by the connecting member 52 is formed.

At this time, the spacer 50 can define the distance between the mounting surface 42 of the heat sink 40 and the circumference 34 of the opening of the housing 30. As a result, the spacer 50 can define the distance W between the outer edge surface 66B on the exit side of the flange portion 66 of the surrounding member 60 and the circumference 34 of the opening of the housing 30.
Thereby, the main constituent members of the optical engine 2 can be fixed at an optimum distance W according to the length of the spacer 50. In particular, the amount of compression of the seal member 20 can be reliably set so that the seal member 20 exerts the optimum compressive force. The optimum distance W is preferably a distance in the elastic deformation region where the sealing member 20 generates a sufficient elastic force and returns to the original state when the compressive load is removed. The optimum distance W can be appropriately determined according to the material characteristics of the sealing member 20.

As described above, since the elastic sealing member 20 can be compressed and attached by the spacer 50 at an optimum constant compression rate, the sealing property between the package 12, the lens array 6, the surrounding member 60 and the housing 30 can be improved. And the holding capacity of the lens array 6 and the surrounding member 60 can be surely increased.

(Projector according to one embodiment)
Next, a case where the light source device 10 and the optical engine 2 shown in the above-described embodiment are used as an optical engine in a so-called one-chip type DLP projector will be described with reference to FIG. 7. FIG. 7 is a schematic view showing an outline of the projector according to one embodiment of the present invention, and is a schematic plan view of the projector as viewed from above.

In FIG. 7, the light collected by the condensing lens of the optical system arranged in the housing of the optical engine 2 is irradiated to the phosphor wheel 110 so as to have a predetermined spot diameter. The phosphor wheel 110 is composed of a transparent disk-shaped member that transmits light, and rotates about a rotation axis. Further, the center of the phosphor wheel 110 is fixed to the drive shaft of the drive motor 130. Here, the material of the phosphor wheel 110 may be any material having a high light transmittance, and for example, glass, transparent ceramics, resin, a crystal substrate such as sapphire or gallium nitride can be used. Further, the phosphor wheel 110 may be a reflective type that reflects light, and may be an optical system suitable for the reflective type.

The phosphor layer is excited by the light emitted from the blue semiconductor laser as the light source, and generates fluorescence in a wavelength band different from the wavelength band of the light emitted from the blue semiconductor laser. In other words, the phosphor layer can convert the wavelength of the light emitted from the blue semiconductor laser. The phosphor layer generates fluorescence (red light) in a wavelength band of, for example, 550 to 780 nanometers. An example of a specific material of the phosphor _{layer, YAG, (Sr, Ca)} AlSiN 3: Eu, CaAlSiN 3: Eu, SrAlSiN 3: Eu, K 2 SiF 6: Mn can be cited. However, it is not limited to this.

The drive motor 130 for rotating the phosphor wheel 110 is a brushless DC motor, and is fixed so that the drive axis is orthogonal to the surface of the phosphor wheel 110. The drive motor 130 rotates the phosphor wheel 110 at a rotation speed based on the frame rate of the moving image to be reproduced (the number of frames per second. The unit is [fps]). For example, when playing back a moving image of 60 [fps], it is preferable to set the rotation speed of the phosphor wheel to an integral multiple of 60 rotations per second.

The light emitted from the phosphor wheel 110 enters the DMD (Digital Micromirror Device) element (optical modulation means) 140, which is an optical spatial modulator, via the optical system 120. Then, the image reflected by the DMD element 140 is enlarged by the projection lens 150, which is a projection means, to a predetermined size and projected onto the screen SC.

The DMD element is a matrix of fine mirrors corresponding to each pixel of the image projected on the screen, and the light emitted to the screen SC by changing the angle of each mirror is turned on in microsecond units. / Can be turned off. Here, the angle of the mirror is turned on when the light emitted from the optical engine 2 is reflected to the projection lens 150, and is turned off when the light emitted from the optical engine 2 is not reflected to the projection lens 150. be.

Further, by changing the gradation of the light incident on the projection lens 150 according to the ratio of the time when each mirror of the DMD element is turned on and the time when each mirror is turned off, the gradation based on the image data of the image to be projected is obtained. Display becomes possible. As a result, color images (including moving images) are displayed on the screen SC by controlling the gradation of each of the red light, green light, and blue light sequentially emitted from the phosphor wheel 110 with individual mirrors. Can be projected. That is, light in a plurality of wavelength bands emitted from the phosphor wheel 110 is sequentially modulated by the DMD element (optical modulation means) 140 to form an image, and the image is enlarged by the projection lens (projection means) 150. Can be projected.

According to the present embodiment, by using a small and high output optical engine 2 capable of suppressing adhesion of dust and the like to the collimating lens, it is possible to provide a small and high output projector having high optical performance. In the present embodiment, the DMD element is used as the light modulation means, but the present invention is not limited to this, and any other light modulation element can be used depending on the application.

Although the embodiments and embodiments of the present invention have been described, the disclosed contents may be changed in the details of the configuration, and the invention in which the embodiments and the combinations and orders of the elements in the embodiments are changed are requested. It can be realized without deviating from the scope and idea of.

2 Optical engine 4 Semiconductor laser 6 Lens array 6A Outer edge surface on the exit side 6B Outer edge surface on the incident side 8 Collimating lens 10 Light source device 12 Package 12A End face on the exit side 12B End face on the opposite side to the exit side 12C Side wall 12D Substrate 12E Main body Part 14 Translucent member 16 Rising mirror 18 Lead 20 Sealing member 22 First surface of sealing member 24 Second surface of sealing member 26 Opening 28A Stepped portion
28B Convex 30 Housing 32 Opening 32A Opening inner surface 34 Opening circumference 40 Heat sink 42 Mounting surface 44 Fins 46 Fastening surface
50 Spacer 52 Connecting member 54 Wire 56 Relay part 60 Enclosing member 60A Incident side end face 60B Exit side end face 62 Through hole 64 Inner wall 66 Flange part 66A Incident side outer edge surface 66B Exit side outer edge surface 70 Metal fittings 100 Projector 110 Fluorescent material Wheel 120 Light receiving lens 130 Drive motor 140 DMD element 150 Projection lens SC screen

Claims (8)

With multiple semiconductor lasers
A lens array having a plurality of collimating lenses corresponding to the semiconductor laser, and
An enclosing member having a plurality of through holes composed of an inner wall surrounding an optical path of light emitted from each of the collimating lenses.
With
The incident-side end surface of the surrounding member is in contact with the outer edge surface of the lens array over the entire circumference .
A light source device characterized in that the inner wall is formed of plate-shaped members formed in a grid pattern.
The length of the through hole in the light traveling direction is L, and the length of one side or the value corresponding to one side in the direction substantially orthogonal to the traveling direction of the light of the through hole, or the diameter or the value corresponding to the diameter is D. Then,
2D ≤ L
The light source device according to claim 1, wherein the light source device has the above-mentioned relationship.
The light source device according to claim 1 or 2, wherein the peripheral region of each through hole on the incident side end surface of the surrounding member is in contact with the exit side surface of the lens array.
The light source device according to any one of claims 1 to 3 , wherein the surrounding member is made of a metal material.
The light source device according to any one of claims 1 to 4.
With the housing
With
An optical engine characterized in that the light source device and the housing are connected via an elastic sealing member so that the surrounding member is arranged inside the housing.
A flange portion is formed around the incident side end portion of the surrounding member, and a flange portion is formed.
The first surface of the sealing member is in contact with the surface of the flange portion over the entire circumference, and the second surface of the sealing member located on the side opposite to the first surface is all around the opening on the incident side of the housing. It touches all around and
The optical engine according to claim 5 , wherein the seal member is arranged between the flange portion and the housing in a compressed state.
The light source device according to any one of claims 1 to 4.
A phosphor wheel into which the light emitted from the light source device is incident, and
An optical modulation means for sequentially modulating light in a plurality of wavelength bands emitted from the phosphor wheel based on image data to form an image, and
A projection means for enlarging and projecting the image, and
A projector characterized by being equipped with.
With multiple semiconductor lasers
A lens array having a plurality of collimating lenses corresponding to the semiconductor laser, and
A surrounding member having a plurality of through holes formed by an inner wall surrounding an optical path of light emitted from each of the collimating lenses.
A light source device in which the incident side end surface of the surrounding member is in contact with the outer edge surface of the lens array over the entire circumference.
With the housing
With
An optical engine characterized in that the light source device and the housing are connected via an elastic sealing member so that the surrounding member is arranged inside the housing.

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