JP5129970B2 - Projector device - Google Patents

Description

The present invention relates to a projector device including a reflecting member that reflects light emitted from a light source in a predetermined direction.

  Projector devices that enlarge and project images on a screen have become widespread. In projector apparatuses, the brightness has been increased so that images can be seen on a large screen even in a bright room. For example, Patent Document 1 proposes a projector device that achieves high brightness by using a plurality of light sources. The projector device of Patent Document 1 improves the brightness of projected light by reflecting light emitted from a plurality of light sources by a reflecting member such as a prism, condensing the light at one place, and entering the projection lens or the like. I try to let them.

  However, the projector apparatus having the above-described configuration has a problem that the reflecting member is easily affected by heat. Since a high-wattage lamp such as a halogen lamp or a xenon lamp is used as the light source of the projector device, the reflecting member that directly receives the irradiation light is heated by the irradiation light. Further, the reflecting member is usually composed of a plate-like mirror, a block-like prism, or the like, and has a small surface area, so that it is difficult to dissipate heat around it. Also, in projector devices, etc., only the three primary color components of R, G, and B are used out of the light emitted from the illumination unit, and infrared light components and ultraviolet light components are excluded within the illumination unit. There are many. Accordingly, the reflecting member often has a function of transmitting or absorbing infrared light and ultraviolet light.

Thus, in addition to receiving the irradiation light of the light source directly, the reflecting member becomes extremely high in temperature due to heat from infrared light and ultraviolet light and a shape that is difficult to dissipate. If the reflecting member is thermally expanded or deformed by heating, the amount of light incident on the projection lens or the like may be reduced, and the image may become dark or the image may be disturbed. In order to prevent such a problem due to heat, in Patent Document 1, the reflecting member is cooled by cooling means such as a fan.
JP 2000-206619 A

  However, if the reflecting member is forcibly cooled by the cooling means, there is a risk that the reflecting member may be damaged due to overcooling. In addition, when a dedicated cooling means or the like is provided on the reflecting member, the cost increases due to an increase in the number of parts such as the cooling means itself or the holding member, and power consumption increases. For this reason, there is a strong demand for efficiently dissipating the reflecting member in an environment where gentle winds by a fan or the like provided in the apparatus pass without using a dedicated cooling means, so that the reflecting member does not reach a high temperature. It was.

SUMMARY An advantage of some aspects of the invention is that it provides a projector device that can efficiently dissipate heat from a reflecting member without causing damage to an optical component due to overcooling. .

In order to achieve the above object, a projector device of the present invention includes a first light source that irradiates light , a second light source, and a first reflecting member that has a reflecting surface that reflects light emitted by the first light source in a predetermined direction. And an illuminating unit comprising a second reflecting member having a reflecting surface that reflects the light emitted by the second light source in a predetermined direction, and a projection optical system that projects the light emitted from the illuminating unit , Each reflecting member is composed of a plate-like reflecting mirror on which the reflecting surface is formed and a holder that holds the reflecting mirror in a state where the reflecting surface is exposed, and the holder includes a plate-like base plate and A plurality of ribs that are fixed to the base plate in a state where the reflection mirror is held between the presser plate and the base plate, and project in a streak pattern on the back surface of the base plate. There is provided integrally with the respective base plates, each The sources are arranged so as to face each other, and each of the reflecting members is vertically shifted between the light sources and arranged in a cross shape. The reflecting mirror of the first reflecting member is irradiated by the first light source. The angle is adjusted so that the reflected light is reflected, and the reflection mirror of the second reflecting member reflects the light irradiated by the second light source and enters the projection optical system .

The holder is preferably formed of a metal material having high thermal conductivity.

In the present invention, the reflection member and the holder constitute a reflection member, and the holder is provided with a plurality of protrusions. Each protrusion prevents the thermal expansion and deformation of the reflecting member when heated by the irradiation light by increasing the surface area of the provided surface and improving the heat dissipation of the holder. in this way,
Since the heat dissipation is improved to efficiently dissipate heat to prevent the reflection member from being deformed, there is no fear of causing damage to the optical component due to overcooling. Further, since a dedicated fan or the like for cooling the reflecting member is not required, power consumption is not increased and costs are not increased.
Furthermore, by using two light sources, a high-luminance image can be projected on the screen. In addition, since each reflecting member is arranged so as to be shifted up and down, the reflected light is not blocked, and the lateral dimension of the projector can be reduced. In addition, the irradiation light of the first light source is irradiated near the lower end of the reflection surface of the first reflecting member, and the irradiation light of the second light source is irradiated near the upper end of the reflection surface of the second reflecting member. The deviation of the light incident on the condensing optical system for condensing the light reflected by the member into one place and making it incident on the projection optical system can be minimized. In addition, it is possible to further suppress the deviation of the light incident on the condensing optical system by providing a tilt angle to each reflecting member.

  As shown in FIG. 1, the liquid crystal projector (projector apparatus) 10 includes an illumination unit (illumination apparatus) 11, a condensing optical system 12, a liquid crystal panel 13, and a projection optical system 14. Further, the illumination unit 11 is provided with two light sources 15 and 16 and a reflection optical system 17 that changes the direction of irradiation light of each of the light sources 15 and 16 by reflection. The liquid crystal projector 10 is a so-called two-lamp / single-plate projector, and projects a high-luminance image on the screen SC by using two light sources 15 and 16.

  Each light source 15 and 16 is comprised by the bulb | ball which irradiates light, the reflector which condenses irradiated light to one direction, etc. The light sources 15 and 16 face each other and are arranged so that the light irradiation direction is substantially perpendicular to the optical axis OA of the condensing optical system 12, the liquid crystal panel 13, and the projection optical system 14. . For each of these light sources 15 and 16, for example, a high-wattage lamp that emits white light, such as a halogen lamp, a xenon lamp, or an ultra-high pressure mercury lamp, is used.

  The reflection optical system 17 is provided with a reflection member 20 corresponding to the light source 15 and a reflection member 21 corresponding to the light source 16. Each of the reflection members 20 and 21 is formed in a substantially plate shape, and has a reflection surface having light reflection characteristics on one surface. The illuminating unit 11 causes the light emitted from the light sources 15 and 16 to enter the condensing optical system 12 by reflecting the light emitted from the light sources 15 and 16 on the reflecting surfaces of the reflecting members 20 and 21. In FIG. 1, each of the reflecting members 20 and 21 has a cross shape, and the reflected light toward the condensing optical system 12 appears to be blocked. However, since the light source 15 and the reflecting member 20 and the light source 16 and the reflecting member 21 are actually paired and shifted in a direction perpendicular to the paper surface (see FIG. 3), the reflected light Will not be blocked.

  The condensing optical system 12 makes the irradiation light from the illumination unit 11 substantially parallel light, uniforms the spatial energy distribution, and uniformly illuminates the liquid crystal panel 13. In addition, this condensing optical system 12 is comprised by a collimator lens, a fly eye lens, a condenser lens etc., for example.

  The liquid crystal panel 13 spatially modulates the polarization state of incident light according to application of a voltage. In addition, polarizing plates (not shown) are provided before and after the liquid crystal panel 13. The incident-side polarizing plate aligns the transmitted light with the linearly polarized light in one direction and enters the liquid crystal panel 13. The exit side polarizing plate forms an image by replacing the difference in polarization state of the light modulated by the liquid crystal panel 13 with the difference in light intensity. The projection optical system 14 is a projection lens composed of a plurality of lenses, for example, and projects light on which an image is formed by the liquid crystal panel 13 onto the screen SC.

  As shown in FIG. 2, the reflecting member 20 includes a substantially flat reflecting mirror 30 having a reflecting surface 30 a and a holder 32 that holds the reflecting mirror 30. The holder 32 includes a substantially flat base plate 34 that is slightly larger than the reflecting mirror 30 and a pressing plate 35 formed in a substantially U-shape. The holding plate 35 is attached to the base plate 34 with three screws 36. The holder 32 holds the reflection mirror 30 by being sandwiched between the base plate 34 and the pressing plate 35. Further, the holder 32 exposes the reflection surface 30 a of the reflection mirror 30 held from the cutout portion 35 a of the pressing plate 35. In addition, since the reflection member 21 has the same configuration as the reflection member 20, the detailed description is omitted.

  As shown in FIG. 3, the illumination unit 11 holds the column 40 that holds the reflecting members 20 and 21, the lamp housings 41 and 42 that hold the light sources 15 and 16, and the lamp housings 41 and 42, respectively. Brackets 43 and 44, and a support 46 and a base 46 for fixing the brackets 43 and 44 to each other. The illumination unit 11 maintains the positional accuracy of each unit by fixing the light sources 15 and 16 and the reflection optical system 17 on the same base 46.

  The support column 40 holds the reflecting members 20 and 21 while being shifted up and down. The lamp housings 41 and 42 are formed in a substantially rectangular tube shape, and hold the light sources 15 and 16 so as to be housed in the internal space. The brackets 43 and 44 hold the lamp housings 41 and 42 with the corresponding light sources 15 and 16 and the reflecting members 20 and 21 facing each other. Moreover, after each member is positioned, the angle of the reflecting members 20 and 21 is adjusted so that the reflected light travels toward the condensing optical system 12. Thereby, the irradiation light of each light source 15 and 16 is reflected by the reflection optical system 17 and enters the condensing optical system 12.

By the way, when the reflecting members 20 and 21 are attached while being shifted up and down, the liquid crystal projector 1
Although the lateral dimension of 0 in the lateral direction can be reduced, there is a problem in that light incident on the condensing optical system 12 is also shifted up and down. For this reason, each reflection member 20 and 21 is attached to the support | pillar 40 so that the notch part 35a may face each other. Be attached this way each reflecting member 20, 21 to the support 40, the reflective member (second reflecting member) 20 near the upper end of the reflecting surface 30a of the count on irradiation light source (second light source) 15, the reflecting member (second (One reflecting member) By irradiating the light emitted from the light source (first light source) 16 to the vicinity of the lower end of the reflecting surface 30a of the light 21, the distance in the vertical direction of each irradiated light approaches, and the shift of the light incident on the condensing optical system 12 Can be made as small as possible. In addition, you may make it further suppress the shift | offset | difference of the light which injects into the condensing optical system 12 by giving each reflective member 20 and 21 a tilt angle.

  Further, as shown in FIG. 4, a plurality of ribs (protruding portions) 50 protruding in a streak shape are provided on the back surface of the base plate 34 of each reflecting member 20, 21. Each of these ribs 50 is formed integrally with the base plate 34. Each reflecting member 20, 21 directly receives the irradiation light of each light source 15, 16, and thus becomes very hot when the liquid crystal projector 10 is in operation. Each rib 50 increases the heat dissipation of the reflecting members 20 and 21 by increasing the surface area of the back surface of the base plate 34. In order to further improve heat dissipation, it is preferable to use a metal material having high thermal conductivity such as aluminum or copper for the base plate 34.

  On the back surface of the base plate 34 of each reflecting member 20, 21, in addition to the respective ribs 50, a plate-like mounting portion 52 that protrudes substantially perpendicularly from the back surface and is in contact with one side end surface is provided. Yes. Each reflection member 20 and 21 is attached to the support | pillar 40 by screwing through these attachment parts 52, for example. Further, each attachment portion 52 is formed to be shorter than the center position in the lateral direction of the base plate 34 in order to prevent mutual interference when attaching to the support column 40.

  The support column 40 is formed in a substantially L shape including a first plate portion 40 a and a second plate portion 40 b, and is attached to the pedestal 46 so that the apex of the bent portion faces the condensing optical system 12. At this time, the outer surfaces of the plate portions 40a and 40b facing the light sources 15 and 16 are substantially parallel to the reflecting surface 30a when the reflecting members 20 and 21 are adjusted to an appropriate angle. ing.

  As described above, the reflecting members 20 and 21 are formed in the same shape. The reflection member 20 is attached to the support column 40 by placing the attachment portion 52 on the upper surface of the first plate portion 40a with the attachment portion 52 facing upward. For this reason, the height of the support | pillar 40 is made higher than the length of the vertical direction of the reflection member 20. As shown in FIG. On the other hand, the reflection member 21 is attached to the support column 40 by placing the attachment portion 52 on the upper surface of the second plate portion 40b with the attachment portion 52 facing downward. Accordingly, the reflecting members 20 and 21 are held in a state where the notches 35a face each other and the angle is adjusted so that the light reflected by the reflecting surfaces 30a is directed to the condensing optical system 12.

  Next, the operation of the present invention will be described. The liquid crystal projector 10 turns on the light sources 15 and 16 when an image display is instructed by the user. Irradiation light from each light source 15, 16 is reflected by the reflecting surface 30 a of each reflecting member 20, 21 and enters the condensing optical system 12. At this time, the reflecting members 20 and 21 are heated by the irradiation light of the light sources 15 and 16. Moreover, each reflection member 20 and 21 permeate | transmits or absorbs the infrared light and ultraviolet light which are contained in the irradiation light of each light source 15 and 16, and is heated also by these infrared light and ultraviolet light.

  The reflecting members 20 and 21 heated by the light emitted from the light sources 15 and 16 and the infrared light and ultraviolet light included therein are accumulated from the back surface of the base plate 34 whose heat dissipation is enhanced by the ribs 50. Spreads heat efficiently. Thereby, thermal expansion, deformation, etc. of each reflective member 20 and 21 are prevented.

  The light emitted from the illumination unit 11 through the reflection of the reflecting members 20 and 21 enters the condensing optical system 12. The condensing optical system 12 makes incident light substantially parallel light and uniformizes the spatial energy distribution. The light emitted from the condensing optical system 12 is projected on the screen SC by the projection optical system 14 after an image is formed by the liquid crystal panel 13.

  As described above, according to the present embodiment, the plurality of ribs 50 are provided on the back surface of the holder 34, and heat is efficiently released from the back surface of the holder 34 whose heat dissipation is enhanced by the ribs 50. Since the thermal expansion and deformation of 21 are prevented, there is no fear of damaging the optical component due to overcooling. Further, since a dedicated fan or the like for cooling the reflecting members 20 and 21 is not required, the heat radiation of the reflecting members 20 and 21 can be efficiently performed without causing an increase in power consumption or an increase in cost. it can.

  In the present embodiment, the plurality of ribs 50 are formed as the protrusions. However, the shape of the protrusions is not limited to this, and may be, for example, a columnar shape. Further, the protruding portion is not limited to being integrally formed, and may be fixed by screwing or the like after being formed as another component. Further, the protruding portion is not limited to the back surface, and may be provided on another surface such as an upper surface or a side surface.

  In the present embodiment, the reflecting members 20 and 21 including the reflecting mirror 30 and the holder 32 are shown. However, the reflecting member is not limited to this, and for example, one surface of a metal plate such as aluminum is mirror-finished. It is good also as what was shape | molded by one member, forming a reflective surface and forming a protrusion part in the other surface. Furthermore, the reflecting member is not limited to a plate shape, and may be, for example, a block shape.

  In the present embodiment, an example in which the present invention is applied to the liquid crystal projector 10 is shown. However, the present invention is not limited to this, and for example, a DLP projector using a DMD element for light modulation, and a slide The present invention may be applied to other types of projector devices such as a projector and an overhead projector. In addition, the present invention is not limited to this, and the present invention may be applied to lighting devices of other optical devices such as a rear projection television.

It is explanatory drawing which shows the structure of a liquid crystal projector roughly. It is a disassembled perspective view which shows the structure of a reflection member roughly. It is a perspective view which shows the structure of an illumination part schematically. It is the perspective view which looked at the reflective optical system from the back direction.

Explanation of symbols

10 Liquid crystal projector (projector device)
11 Illumination unit (illumination device)
14 Projection optical system 15, 16 Light source 20, 21 Reflective member 30 Reflective mirror 30a Reflective surface 32 Holder 50 Rib (projecting part)

Claims (3)

A first light source for irradiating light , a second light source , a first reflecting member having a reflecting surface for reflecting light emitted from the first light source in a predetermined direction, and light emitted by the second light source in a predetermined direction In a projector apparatus comprising: an illuminating unit that includes a second reflecting member having a reflecting surface that reflects the light; and a projection optical system that projects light emitted from the illuminating unit .
Each reflecting member is composed of a plate-like reflecting mirror on which the reflecting surface is formed, and a holder that holds the reflecting mirror in a state where the reflecting surface is exposed,
The holder has a plate-like base plate and a pressing plate, and the pressing plate is fixed to the base plate in a state of holding the reflection mirror between the base plate,
A plurality of ribs protruding in a streak pattern on the back of each base plate are provided integrally with each base plate ,
The light sources are arranged to face each other,
Each of the reflecting members is shifted up and down between the light sources and is combined in a cross shape. The reflecting mirror of the first reflecting member reflects the light emitted by the first light source, and the second The projector apparatus according to claim 1, wherein the reflection mirror of the reflecting member reflects the light emitted from the second light source and is incident on the projection optical system . The presser plate is formed in a U-shape to cover the vicinity of three sides of all four sides of the outer periphery of the reflection mirror,
Each reflecting member is arranged such that one of the four outer peripheral sides of each reflecting mirror that is not covered by the pressing plate is opposed to each other in the vertical direction, and the reflecting surface of the first reflecting member arranged above The irradiation light of the first light source is irradiated in the vicinity of the lower end of the first light source, the irradiation light of the second light source is irradiated in the vicinity of the upper end of the reflection surface of the second reflection member arranged below, and each of the reflection members The projector device according to claim 1, wherein each of the reflecting members is angled so as to reduce a deviation of the light reflected by the projector. The projector device according to claim 2 , wherein the holder is formed of a metal material having high thermal conductivity.

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