JP2005128210A - projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which can reduce the cost and improve the recycling rate. <P>SOLUTION: A packaging case 2, as a molding product made of a synthetic resin, includes an upper case constituting the ceiling surface of the projector 1 and a lower case 21 constituting the bottom surface of the projector 1. A plurality of optical component mounting parts 211A which stand toward the inside of the packaging case 2 and on which a plurality of optical components are mounted are formed on the bottom surface 211 of the lower case 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, an exterior case that forms an exterior, and a light beam that is installed in the exterior case and is emitted from a light source is modulated by a light modulator according to image information to form an optical image, and the optical image is enlarged and projected. A projector including an optical unit is known (for example, see Patent Document 1).
The optical unit includes a lens that superimposes a light beam emitted from a light source on an image forming region of a light modulation device, a dichroic mirror that separates the light beam emitted from the light source into three colored lights (R, G, and B), and a light source. An optical component such as a reflection mirror that guides the emitted light beam to the light modulation device, and an optical component housing that stores and arranges these optical components at predetermined positions on the illumination optical axis of the light beam emitted from the light source. .
Among these, the housing for optical components is a molded product made of synthetic resin manufactured by injection molding or the like, and the inner surface is configured as an outer position reference surface of the optical component, and the optical component is slidable Grooves are formed for fitting in. Then, after the optical component is fitted in the groove of the optical component housing, the optical component is bonded and fixed by an adhesive or biased and fixed by a biasing member.

JP 2002-31843 A

In the projector described in Patent Document 1, in order to install a plurality of optical components in the exterior case, the plurality of optical components are accommodated in the optical component casing, and then the optical component casing is installed in the exterior case. doing. For this reason, it is difficult to satisfy the basic requirement of cost reduction, and there is a demand for the development of a projector having a structure that can omit the optical component casing.
Also, considering the problem of recycling of the optical component casing, a plurality of optical components are bonded and fixed to the grooves of the optical component casing, so the plurality of optical components are removed from the optical component casing. However, the adhesive adheres to the groove, and in this state, the optical component casing cannot be sufficiently recycled. Therefore, the recycling rate of the entire projector is reduced. In addition, in order to recycle the optical component casing, it is necessary to completely remove the adhesive adhered to the groove, which causes an operator to perform complicated operations.
Here, in order to improve the recycling rate, it is conceivable that the material of the optical component casing is formed of a metal member. However, the manufacturing cost is lower than the manufacturing cost of the synthetic resin optical component casing. As the price rises, the weight cannot be reduced.

  An object of the present invention is to provide a projector capable of reducing the cost and improving the recycling rate.

  The projector of the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, and a plurality of light beams that guide the light beam emitted from the light source device to the light modulation device. An optical component, a projection optical device for enlarging and projecting the light beam modulated by the light modulation device, the light source device, the light modulation device, the plurality of optical components, and an outer casing that houses the projection optical device therein The exterior housing is a synthetic resin molded product, and includes an upper housing that forms the top surface of the projector and a lower housing that forms the bottom surface of the projector. The upper casing or the lower casing is formed with a plurality of optical component mounting portions that stand toward the inside of the exterior casing and to which the plurality of optical components are mounted. To.

Here, as the plurality of optical components, for example, a lens that superimposes the light beam emitted from the light source device on the image forming region of the light modulation device, a reflection mirror that guides the light beam emitted from the light source device to the light modulation device, In the case of having a plurality of light modulation devices, a plurality of dichroic mirrors for separating a light beam emitted from the light source device into a plurality of color lights can be exemplified.
Further, the exterior casing only needs to include at least an upper casing and a lower casing, and the top, bottom, and side surfaces of the projector may be configured only by the upper casing and the lower casing. A side housing may be provided in addition to the housing and the lower housing, and the side surface may be configured by the side housing.
According to the present invention, since the plurality of optical component mounting portions are formed in the upper casing or the lower casing, the plurality of optical components can be fixed to the upper casing or the lower casing, and the conventional optical The structure is such that the component housing can be omitted. Therefore, the manufacturing cost of the projector can be reduced by omitting the optical component casing.
In addition, the exterior casing is made of synthetic resin, and the plurality of optical component mounting portions are erected from the upper casing or the lower casing. It is easy to break. For example, even when a plurality of optical components that are bonded and fixed to a plurality of optical component mounting portions with an adhesive or the like are removed from the exterior housing, the adhesive is attached to the plurality of optical component mounting portions. The adhesive does not remain in the upper casing or the lower casing by breaking the plurality of optical component mounting portions. Therefore, the upper casing or the lower casing can be sufficiently recycled, and the recycling rate of the entire projector can be improved as compared with a projector including a conventional optical component casing.

In the projector according to the aspect of the invention, the light that is perpendicular to the light path forming surface formed by the light beam that passes through the light source device, the plurality of optical components, the light modulation device, and the projection optical device is shielded. It is preferable that a light shielding member is provided.
Here, the material of the light-shielding member is not particularly limited, but it is preferable to form the light-shielding member by subjecting a plate body such as aluminum to sheet metal processing in consideration of ease of manufacture.
According to the present invention, since the projector includes the light blocking member, the light that is out of the optical path of the light beam passing through the light source device, the plurality of optical components, the light modulation device, and the projection optical device is formed in the exterior housing. Further, it is possible to avoid leakage from the projector through, for example, an intake opening or an exhaust opening.

In the projector according to the aspect of the invention, the light source device, the plurality of optical components, the light modulation device, and an optical path forming surface formed by an optical path passing through the projection optical device, and the plurality of optical component mounting portions It is preferable to include a reinforcing member that is installed on an end surface where the upper housing or the lower housing is reinforced.
Here, the material of the reinforcing member is not particularly limited. However, in consideration of ease of manufacture, it is preferable to form a plate body such as aluminum by sheet metal processing in the same manner as the above-described light shielding member.
According to the present invention, the projector includes the reinforcing member, and the reinforcing member is installed on an end surface of the upper housing or the lower housing where the plurality of optical component mounting portions stand. Thus, for example, the stress applied to the upper housing or the lower housing from the optical component mounting portion due to the weight of the plurality of optical components, and the optical component mounting portion from the plurality of optical components due to the light flux emitted from the light source device. It is possible to avoid deformation of the upper casing or the lower casing due to heat transmitted to the upper casing or the lower casing.

In the projector according to the aspect of the invention, the reinforcing member is formed to extend so as to planarly interfere with a part of the projection optical device, and the projection optical device is interposed via an attachment member for attaching the projection optical device. It is preferable that it is attached to the reinforcing member.
Here, as the attachment member, for example, a structure provided integrally with a lens barrel constituting the projection optical apparatus may be provided, and a structure having a structure that can be attached to a part of the lens barrel as a separate member from the lens barrel. It is good.
By the way, when the exterior casing is a molded product made of synthetic resin, the projection optical device is heavier than other optical components, so the projection optical device is fixed at the optical component mounting portion described above. Difficult to do. Therefore, in order to correspond to the weight of the projection optical apparatus, a metal projection optical apparatus support structure having a predetermined thickness dimension and having an L shape in a side view is generally used. In the projection optical device support structure, one end surface of the L shape extends along the top surface or the bottom surface of the upper housing or the lower housing, and the other end surface is orthogonal to the top surface or the bottom surface. The projection optical device is supported and fixed on the other end face.
However, in order to correspond to the weight of the projection optical apparatus, the thickness dimension of the projection optical apparatus support structure must be formed relatively thick, and the extension direction dimension of one end face needs to be formed relatively long. Therefore, the weight of the projection optical device support structure is increased, and the weight reduction of the projector is hindered.
According to the present invention, the reinforcing member is formed so as to planarly interfere with a part of the projection optical device, and the projection optical device is attached to the reinforcing member via the attachment member. A support structure is not required, and the weight of the projector can be reduced.

In the projector according to the aspect of the invention, it is preferable that the reinforcing member is composed of a heat conductive member.
According to the present invention, the reinforcing member is formed of a member having good thermal conductivity, for example, a metal member, and thus is generated in a plurality of optical components, a light modulation device, or the like by a light beam emitted from the light source device. The structure is such that heat can be dissipated to the reinforcing member, and the cooling efficiency of the optical component, the light modulation device, etc. can be improved.

In the projector according to the aspect of the invention, it is preferable that the plurality of optical components are bonded and fixed to the plurality of optical component mounting portions, and the plurality of optical component mounting portions are configured to be breakable.
Here, the plurality of optical component mounting portions are configured to be breakable, for example, in the optical component mounting portion, a configuration in which a groove is formed on the base end side from a portion where the optical components are bonded and fixed is adopted. it can. Further, if the optical component mounting portion is configured to be breakable, the groove or the like need not be formed.
According to the present invention, the plurality of optical component mounting portions are configured to be breakable. For example, if the optical component mounting portion is configured to be breakable on the base end side relative to the portion where the optical component is bonded and fixed, When removing the optical components from the housing, the adhesive attached to the exterior housing can be reliably removed by breaking the plurality of optical component mounting portions. Therefore, it is possible to sufficiently recycle the exterior housing and improve the recycling rate of the entire projector.

[1. First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[1-1. Projector configuration]
FIG. 1 is a plan view showing a schematic configuration of a projector 1 according to the first embodiment. Specifically, FIG. 1 is a plan view of the interior of the projector 1 with the top housing of the exterior housing constituting the top surface removed.
The projector 1 modulates the light beam emitted from the light source according to the image information, and enlarges and projects it on a projection surface such as a screen. As shown in FIG. 1, the projector 1 includes an exterior case 2 as an exterior housing, a light source device 3, an integrator illumination optical system 4, a color separation optical system 5, a relay optical system 6, and an optical device 7. And a projection lens 8 as a projection optical device.
Although not specifically shown, the projector 1 includes a power supply unit that supplies power supplied from the outside to the constituent members of the projector 1 in addition to the members 2 to 8 described above, and a liquid crystal panel described later of the optical device 7. And a cooling unit having a cooling fan for blowing cooling air to the constituent members of the projector 1.

The exterior case 2 is, for example, a molded product made of a synthetic resin such as polycarbonate-ABS resin (amorphous thermoplastic resin made from acrylonitrile, butadiene, or styrene), so-called polycarbonate ABS. It comprises, and each member 2-8 mentioned above is accommodated and arrange | positioned inside. The exterior case 2 includes a lower case 21 as a lower case and an upper case (not shown) as an upper case.
Although the details will be described later, the lower case 21 is formed in a container shape so as to constitute the bottom and side surfaces of the projector 1. Although not shown, the lower case 21 has an intake opening for taking in air outside the projector 1 by the cooling unit, and an exhaust opening for discharging the internal air to the outside. Is formed.
The upper case is formed in the shape of a lid that forms the top surface of the projector 1, and closes the opening of the lower case 21 when combined with the lower case 21.

  The light source device 3 is installed at a predetermined position on the bottom surface of the lower case 21 and emits a light beam toward the optical device 7. As shown in FIG. 1, the light source device 3 includes a light source lamp 31 as a radiation light source, a reflector 32, an explosion-proof glass 33 that covers a light emission surface of the reflector 32, and the light source lamp 31, the reflector 32, and the explosion-proof glass 33. And a lamp housing 34 for housing and arranging the lamp. Then, the radial light flux emitted from the light source lamp 31 is reflected by the reflector 32 to become a substantially parallel light flux, and is emitted to the outside. In the present embodiment, a high-pressure mercury lamp is used as the light source lamp 31, and a parabolic mirror is used as the reflector 32. Note that the light source lamp 31 is not limited to a high-pressure mercury lamp, and may be a metal halide lamp, a halogen lamp, or the like. Moreover, although the parabolic mirror is employ | adopted as the reflector 32, it is not restricted to this, You may employ | adopt the structure which has arrange | positioned the collimating concave lens in the exit surface of the reflector which consists of an ellipsoidal mirror.

The integrator illumination optical system 4 is an optical system for making the luminous flux emitted from the light source device 3 uniform in the illumination optical axis orthogonal plane. The integrator illumination optical system 4 includes a first lens array 41, a second lens array 42, a polarization conversion element 43, and a superimposing lens 44, as shown in FIG.
The first lens array 41 has a configuration in which small lenses having a substantially rectangular outline when viewed from the illumination optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 31 into partial light beams and emits them in the direction of the illumination optical axis.
The second lens array 42 has substantially the same configuration as the first lens array 41, and includes a configuration in which small lenses are arranged in a matrix. The second lens array 42 has a function of forming an image of each small lens of the first lens array 42 together with the superimposing lens 44 in an image forming region of a light modulation device (to be described later) of the optical device 7.

The polarization conversion element 43 converts the light from the second lens array 42 into substantially one type of polarized light, and thus the light use efficiency in the optical device 7 is enhanced.
Specifically, each partial light beam converted into approximately one type of polarized light by the polarization conversion element 43 is finally substantially superimposed on an image forming area of a light modulation device (to be described later) of the optical device 7 by the superimposing lens 44. In a projector using a light modulation device of a type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light flux from the light source lamp 31 that emits randomly polarized light is not used. For this reason, by using the polarization conversion element 43, the light beams emitted from the light source lamps 31 to 31 are converted into substantially one type of polarized light, and the light use efficiency in the optical device 7 is enhanced. Such a polarization conversion element 43 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

The color separation optical system 5 includes two dichroic mirrors 51 and 52 and a reflection mirror 53. A plurality of partial light beams emitted from the integrator illumination optical system 4 are separated into three color lights of red (R), green (G), and blue (B) by two dichroic mirrors 51 and 52.
The relay optical system 6 includes an incident side lens 61, a relay lens 63, and reflection mirrors 62 and 64. The relay optical system 6 has a function of guiding the blue light, which is the color light separated by the color separation optical system 5, to a light modulation device for blue light described later of the optical device 7.

  At this time, the dichroic mirror 51 of the color separation optical system 5 transmits the green light component and the blue light component and reflects the red light component of the light beam emitted from the integrator illumination optical system 4. The red light reflected by the dichroic mirror 51 is reflected by the reflection mirror 53, passes through the field lens 79, and reaches a light modulator for red light described later. The field lens 79 converts each partial light beam emitted from the second lens array 42 into a light beam parallel to the central axis (principal light beam). The same applies to the field lens 79 provided on the light incident side of the other light modulators for green light and blue light.

Of the blue light and green light transmitted through the dichroic mirror 51, the green light is reflected by the dichroic mirror 52, passes through the field lens 79, and reaches a light modulator for green light, which will be described later. On the other hand, the blue light passes through the dichroic mirror 52, passes through the relay optical system 6, further passes through the field lens 79, and reaches a light modulator for blue light described later.
The reason why the relay optical system 6 is used for blue light is that the optical path length of the blue light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light divergence or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 61 to the field lens 79 as it is. The relay optical system 6 is configured to pass blue light of the three color lights, but is not limited thereto, and may be configured to pass red light, for example.
The integrator illumination optical system 4, the color separation optical system 5, the relay optical system 6, and the field lens 79 described above correspond to the optical component according to the present invention.

FIG. 2 is a diagram illustrating a configuration of the optical device 7. Specifically, FIG. 2A is a diagram of the optical device 7 viewed from the light beam exit side, and FIG. 2B is a plan view of the optical device 7 viewed from above, and FIG. These are the figures which looked at the optical apparatus 7 from the incident side of red light. FIG. 2 shows a state where the support 76 is attached only to the R color light side, and it is assumed that the support 76 is originally attached to each of the three color light sides.
The optical device 7 modulates an incident light beam according to image information to form a color image. This optical device 7 includes three incident-side polarizing plates 71 into which the respective color lights separated by the color separation optical system 5 are incident, three light modulation devices 72 disposed at the subsequent stage of each incident-side polarizing plate 71, and Three exit-side polarizing plates 73, a cross dichroic prism 74, a heat conducting plate 75 that holds the exit-side polarizing plate 73, a support 76 that supports the light modulator 72 and the incident-side polarizing plate 71, and a pedestal 77 And a heat insulating pin 78, and these members 71 to 78 are integrated as a unit.

The incident-side polarizing plate 71 transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 5 and absorbs other light beams. A polarizing film is provided on a substrate such as sapphire or quartz. It is affixed.
The three light modulators 72 include three liquid crystal panels (not shown) and three holding frames 722 (each holding a liquid crystal panel for red light 722R and a holding frame for a liquid crystal panel for green light 722G) holding each liquid crystal panel. , The holding frame of the liquid crystal panel for blue light is 722B), and is arranged on the light beam incident side of the cross dichroic prism 74 so as to correspond to each color light of RGB.
Each liquid crystal panel uses, for example, a polysilicon TFT as a switching element, and the liquid crystal is hermetically sealed in a pair of transparent substrates arranged opposite to each other. And these liquid crystal panels modulate and inject | emits the light beam which injects via the incident side polarizing plate 71 according to image information.

  As shown in FIG. 2, the three holding frames 722R, 722G, and 722B are attached to the light flux incident end face of the cross dichroic prism 74 by four heat insulating pins 78 so that each liquid crystal panel is accommodated and held therein. It is configured. And the whole is formed of highly heat conductive members, such as an aluminum alloy. As shown in FIG. 2C, pin insertion holes 722 </ b> A through which the four heat insulating pins 78 are inserted are provided at the corners of each holding frame 722. Further, as shown in FIG. 2A or 2C, two sets of convex portion groups 722C and 722D arranged in parallel in the thickness direction of the holding frame are provided on the side surface of each holding frame 722.

The exit-side polarizing plate 73 has substantially the same function as the incident-side polarizing plate 71, and transmits polarized light in a certain direction among the light beams emitted from the light modulation device 72, and absorbs other light beams. As shown in FIG. 2B, these exit side polarizing plates 73 are supported and fixed to the first exit side polarizing plate 731 attached to the light beam incident end face of the cross dichroic prism 74 and the heat conduction plate 75. And an exit side polarizing plate 732.
The first emission side polarizing plate 731 and the second emission side polarizing plate 732 are configured so as to have different light absorption characteristics, and are arranged so that their polarization axes are parallel to each other. Thus, by making the exit side polarizing plate 73 into a two-body configuration, the heat absorbed by the exit side polarizing plate 73 can be apportioned by two bodies as compared with the case where it is composed of one body, for example. 73 can be prevented from being deteriorated.
Note that the first exit-side polarizing plate 731 and the second exit-side polarizing plate 732 are disposed so that their polarization axes are parallel, and are disposed so as to be substantially orthogonal to the polarization axis of the incident-side polarizing plate 71.

  The cross dichroic prism 74 forms a color image by synthesizing optical images emitted from the emission-side polarizing plate 73 and modulated for each color light. In the cross dichroic prism 74, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are provided in a substantially X shape along the interfaces of four right-angle prisms. Three color lights are synthesized by the dielectric multilayer film.

  The heat conduction plate 75 is formed in a substantially rectangular shape by processing a flat plate of aluminum into a sheet metal, and a first emission side polarizing plate 731 attached to the cross dichroic prism 74 is fitted in a substantially central portion in plan view. An opening (not shown) that can be combined is formed, and a protruding portion 751 (FIG. 2B) having a substantially L-shaped cross section protruding toward the light beam incident side is formed on the left and right edges. The heat conducting plate 75 supports and fixes the second emission side polarizing plate 732 by the projecting portion 751, and is connected to the first emission side polarizing plate 731 attached to the cross dichroic prism 74 so as to be able to transfer heat. At the end, it is fixed to the side surface of the pedestal 77 via an elastic member (not shown) having thermal conductivity.

The support 76 accommodates and holds each light modulation device 72 inside, and supports and fixes the incident-side polarizing plate 71, and is formed of a U-shaped block body made of a metal material such as an aluminum alloy. Yes. And this support body 76 is attached to the mounting part of the prism fixing plate mentioned later of the base 77 via the ultraviolet curable thermal conductive adhesive. Thereby, heat conduction from the support 76 to the pedestal 77 is effectively performed.
In the support 76, although not shown on the inner surface of the U-shaped end edge, it extends in the vertical direction and is formed on both sets of convex groups 722 </ b> C and 722 </ b> D in the holding frame 722 of the light modulator 72. A convex portion to be fitted is provided. As a result, the support 76 is guided between the two convex groups 722 </ b> C and 722 </ b> D of the holding frame 722 when the light modulation device 72 is accommodated in the support 76, and the accommodation operation of the light modulation device 72 by the support 76 is smooth. To be done. In addition, the fitting of the convex groups 722 </ b> C and 722 </ b> D of both sets with the convex portions of the support 76 prevents the light modulation device 72 from coming off in the focus direction. Then, an adhesive is applied between the inner surface of the U-shaped edge of the support 76 and the outer peripheral surface of the holding frame 722 of the light modulator 72, and the light modulator 72 is fixed to the support 76. The

In addition, in the support 76, an incident-side polarizing plate mounting portion 761 for supporting and fixing the incident-side polarizing plate 71 is provided on the light-incident-side end surface of the U-shaped edge as shown in FIG. Yes.
The incident side polarizing plate mounting portion 761 protrudes from the end surface of the light beam incident side of the U-shaped edge of the support 76 toward the light beam incident side, and is close to the incident side polarizing plate mounting portion 761 whose front end in the protruding direction is opposed. It is bent so as to be formed in a substantially L shape. Further, as shown in FIG. 2B, a concave portion 761A that is depressed in the light beam exit direction is formed at the L-shaped tip portion of the incident side polarizing plate mounting portion 761, and an adhesive is interposed in the concave portion 761A. The incident side polarizing plate 71 is fixed.
In addition, as a heat conductive adhesive used for adhesion | attachment of the support body 76 with respect to the light modulation apparatus 72, the incident side polarizing plate 71, and the base 77, elongation rate is high, a glass transition point is low, and it is close to the thermal linear expansion coefficient of aluminum. An adhesive having a thermal expansion coefficient is used. As the adhesive, an ultraviolet curable adhesive, a silicon-based room temperature curable adhesive, a thermosetting adhesive, or the like can be preferably used.

The base 77 is made of an aluminum alloy or the like, and is fixed to the upper and lower surfaces of the cross dichroic prism 74. As shown in FIG. 2, the pedestal 77 is fixed to a substantially rectangular parallelepiped upper pedestal 771 fixed to the upper surface of the cross dichroic prism 74 and the lower surface of the cross dichroic prism 74, and the entire optical device 7 and the projection lens 8 are connected to each other. And a prism fixing plate 772 for supporting and fixing.
Among these, as shown in FIG. 2, the prism fixing plate 772 has a substantially L shape in a side view, and the L-shaped horizontal portion functions as a mounting portion 772A for mounting and fixing the optical device 7. A hanging portion that hangs in a substantially normal direction from the light emission exit end of the mounting portion 772A functions as a projection lens support portion 772B that supports and fixes the projection lens 8.
The mounting portion 772A has a substantially rectangular shape in plan view, and a bulging portion that bulges upward is formed on the upper end surface, but the bulging portion causes the cross dichroic prism 74 to be formed. The position is adjusted and attached to the upper surface of the mounting portion 772A.
Further, as shown in FIG. 2A, the lower end surface of the mounting portion 772A has a convex portion 772A1 that protrudes downward and is positioned at a predetermined position on the bottom surface of the lower case 21, A screw hole (not shown) for attaching to the bottom surface of the lower case 21 is provided. That is, the optical device 7 is configured to be directly attached to the bottom surface of the lower case 21 via the prism fixing plate 772.
As shown in FIG. 2A, the projection lens support 772B has an opening 772B1 for transmitting a light beam at a substantially central portion. Further, a convex portion 772B2 for positioning the projection lens 8 at a predetermined position and a screw hole 772B3 for fixing the projection lens 8 are formed in the vicinity of the opening 772B1, and the projection lens 8 is not shown through a hole (not shown). Then, the screw 83 (FIG. 1) is screwed into the screw hole 772B3, whereby the projection lens 8 is supported and fixed to the projection lens support portion 772B.
The heat conduction plate 75 and the pedestal 77 are not limited to the above-described materials, but include, for example, Al, Mg, Ti, alloys thereof, invar, iron-nickel alloys such as 42Ni-Fe, carbon steel, brass, stainless steel, and the like. A metal or a resin mixed with a carbon filler such as carbon fiber or carbon nanotube (polycarbonate, polyphenylene sulfide, liquid crystal resin, or the like) may be used.

As shown in FIG. 2, the heat insulation pin 78 has a substantially cylindrical shape and is made of a synthetic resin (acrylic material) that transmits ultraviolet light. The heat insulating pin 78 is inserted into the pin insertion hole 722A (FIG. 2C) of the holding frame 722 in the light modulation device 72, and one end thereof is fixed to the light flux incident end surface of the heat conducting plate 75, whereby the light modulation device. 72 is supported and fixed to the heat conductive plate 75.
The heat insulation pin 78 is not limited to an acrylic material, and may be composed of other synthetic resin that transmits ultraviolet light, or may be composed of optical glass, crystal, sapphire, quartz, fluorite, or the like. Also good. Further, the number of the heat insulating pins 78 is not limited to four, and may be two or more. In this case, the number of pin insertion holes 722 </ b> A of the holding frame 722 in the light modulation device 72 may be formed so as to correspond to the number of heat insulating pins 78.

  Although not shown, the projection lens 8 has a combined lens in which a plurality of lenses are combined, and the combined lens is housed and held in the lens barrel 81 (FIG. 1). The lens barrel 81 is provided with a flange 82 (FIG. 1) at the light beam incident side end, and the projection lens 8 supports the projection lens of a prism fixing plate 772 constituting a pedestal 77 via the flange 82. The portion 772B is supported and fixed by a screw 83 (FIG. 1).

[1-2. Configuration of the lower case]
FIG. 3 is an exploded perspective view showing a schematic configuration of the lower case 21.
The lower case 21 constitutes the bottom and side surfaces of the projector 1 and supports and fixes the above-described members 4 to 8 inside.
In the lower case 21, as shown in FIG. 3, a plurality of optical component attachment portions 211A are formed on the bottom surface 211 thereof.
The plurality of optical component mounting portions 211A are columnar members that rise upward from the bottom surface 211 of the lower case 21 and are formed corresponding to the positions where the members 4 to 6 and 79 are arranged. Then, the members 4 to 6 and 9 are bonded and fixed to the optical component mounting portion 211A with an adhesive or the like.
Among these optical component mounting portions 211A, the first lens array 41, the second lens array 42, the polarization conversion element 43, the superimposing lens 44, the dichroic mirrors 51 and 52, the incident side lens 61, the relay lens 63, and the field lens 79 are included. A substantially V-shaped groove 211A1 (see FIG. 4) is formed in the portion to be attached, and each member 41 to 44, 51, 52, 61, 63, 79 has an outer peripheral portion of the groove 211A1 (see FIG. 4). And fixed through an adhesive or the like.
Of these optical component mounting portions 211A, the optical component mounting portion 211A to which the reflecting mirrors 53, 62, and 64 are mounted is formed in a substantially quadrangular prism shape, and the back surfaces of the reflecting mirrors 53, 62, and 64 have a rectangular column shape. It abuts on the side end face and is fixed via an adhesive or the like.
The plurality of optical components 4 to 6 and 79 can be fixed to the lower case 21 by these optical component mounting portions 211A, and a conventional optical component housing can be omitted. Therefore, the manufacturing cost of the projector 1 can be reduced by omitting the optical component casing.

Further, a breakage portion 211A2 that allows the optical component attachment portion 211A to be broken from the bottom surface of the lower case 21 is formed in these optical component attachment portions 211A.
FIG. 4 is a diagram illustrating the broken portion 211A2 of the optical component mounting portion 211A. 4 shows the broken portion 211A2 of the optical component mounting portion 211A to which the incident side lens 61 is mounted. However, the optical component mounting portion 211A to which the other members 4, 5, 62 to 64, 79 are mounted is shown. Are also formed with the same broken portion 211A2.
The broken portion 211A2 is a substantially V-shaped groove that is located on the proximal side with respect to the bonding area AR where the incident side lens 61 is bonded and fixed by an adhesive or the like in the optical component mounting portion 211A and is recessed on the inner side. . Then, by bending the optical component mounting portion 211 </ b> A with respect to the bottom surface of the lower case 21, a crack is formed on the inner side from the broken portion 211 </ b> A <b> 2, and the optical component mounting portion 211 </ b> A is broken from the lower case 21.
By providing the broken part 211A2 in the optical component mounting part 211A in this way, the optical part mounting part 211A can be easily broken from the lower case 21. Further, since the broken portion 211A2 is located on the base end side with respect to the adhesive region AR, when the optical component mounting portion 211A is broken, the adhesive-attached portion together with the optical component mounting portion 211A is removed from the lower case 21. The adhesive does not remain in the lower case 21. Therefore, the exterior case 2 can be sufficiently recycled and the recycling rate of the entire projector 1 can be improved.

  Further, in the lower case 21, as shown in FIG. 3, the bottom surface 211 has a positioning hole 211B through which the convex portion 772A1 (FIG. 2) of the optical device 7 is inserted at the installation position of the optical device 7, and the optical device. 7 fixing holes 211C. Although illustration is omitted, a fixing portion for fixing the lamp housing 34 of the light source device 3 is also formed on the bottom surface 211 of the lower case 21. The optical device 7 and the projection lens 8 are directly fixed to the bottom surface 211 of the lower case 21 through the prism fixing plate 772 by the positioning hole 211B and the fixing hole 211C. The light source device 3 is directly fixed to the bottom surface 211 of the lower case 21 by the fixing portion.

Further, as shown in FIG. 3, a reinforcing member 212 is attached to the bottom surface 211 of the lower case 21 with screws or the like (not shown).
The reinforcing member 212 is formed by processing a flat plate made of aluminum or the like into a sheet metal, and is formed by the light source device 3, the integrator illumination optical system 4, the color separation optical system 5, the relay optical system 6, the optical device 7, and the projection lens 8. A screw (not shown) is attached to the bottom surface 211 of the lower case 21 that extends along the optical path forming surface (the surface along the bottom surface 211 of the lower case 21), and a plurality of optical component attachment portions 211A stand up through fixing holes (not shown). It is attached by etc. The reinforcing member 212 reinforces the bottom surface 211 of the lower case 21.
Although the shape of the reinforcing member 212 is not particularly limited, in the present embodiment, the reinforcing member 212 is formed in a substantially F shape in plan view so as to be installed in a region surrounded by the plurality of optical component mounting portions 211A.
The lower case 21 can be reinforced by attaching the reinforcing member 212 to the bottom surface 211 of the lower case 21, and the bottom surface 211 of the lower case 21 from the optical component mounting portion 211 </ b> A by the weight of the plurality of optical components 4 to 6, 79. The deformation of the lower case 21 due to the stress applied to the lower case 21 and the heat transmitted from the optical components 4 to 6 and 79 to the bottom surface 211 of the lower case 21 via the optical component mounting portion 211A due to the light flux emitted from the light source device 3. Can be avoided.
Further, the reinforcing member 212 is made of aluminum having good thermal conductivity, so that the integrator illumination optical system 4, the color separation optical system 5, the relay optical system 6, and the field lens 79 are generated by the light beam emitted from the light source device 3. Therefore, the cooling efficiency of the optical components 4 to 6 and 79 can be improved.

Furthermore, as shown in FIG. 3, the light shielding member 213 is attached to the bottom surface 211 of the lower case 21 with screws 213C (FIG. 1).
The light shielding member 213 is formed by processing a flat plate of aluminum or the like into a sheet metal, and is installed so as to be orthogonal to the optical path forming surface (a surface along the bottom surface of the lower case 21) and surround the plurality of optical component mounting portions 211A. . As shown in FIG. 3, the light shielding member 213 includes a first light shielding member 213A and a second light shielding member 213B.
The first light shielding member 213A is installed in an L-shaped inner portion of the planar view formed by the integrator illumination optical system 4, the color separation optical system 5, the relay optical system 6, and the optical device 7, and is L-shaped. It is appropriately bent according to the inner shape. The first light shielding member 213A is formed with a plurality of attachment portions 213A1 for attaching the first light shielding member 213A to the bottom surface 211 of the lower case 21 with screws 213C (FIG. 1) along the optical path forming surface. ing.
The second light-shielding member 213B is installed in the outer portion of the L shape in plan view, and is appropriately bent according to the L-shaped outer shape. The second light shielding member 213B is formed with a plurality of attachment portions 213B1 for attaching the second light shielding member 213B to the bottom surface 211 of the lower case 21 with screws 213C (FIG. 1) along the optical path forming surface. ing.
Then, by attaching the first light shielding member 213A and the second light shielding member 213B to the bottom surface 211 of the lower case 21, the light flux that passes through the light source device 3, the optical components 4 to 6, 9, the optical device 7, and the projection lens 8 is reduced. It is possible to avoid leakage of light out of the optical path to the outside of the projector 1 through an intake opening, exhaust opening, etc. (not shown) formed in the exterior case 2, and prevent stray light in the exterior case 2. You can also.
Further, by attaching the first light shielding member 213A and the second light shielding member 213B to the bottom surface 211 of the lower case 21, it is possible to prevent light from leaking to the outside of the projector 1, and the lower case 21 as with the reinforcing member 212 described above. The deformation of the lower case 21 can be avoided.

[2. Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first embodiment, the reinforcing member 212 attached to the bottom surface 211 of the lower case 21 is formed in a substantially F shape in plan view so as to be installed in a region surrounded by the plurality of optical component attaching portions 211A. Yes. Further, the projection lens 8 is supported and fixed to a prism fixing plate 772 of a pedestal 77 constituting the optical device 7, integrated with the optical device 7, and directly fixed to the bottom surface 211 of the lower case 21.
On the other hand, in the second embodiment, the reinforcing member 214 attached to the bottom surface 211 of the lower case 21 extends to the lower side of the optical device 70 and to the lower side of the light incident side of the projection lens 80. Is fixed to the reinforcing member 214, and the projection lens 80 is fixed to the reinforcing member 214 via a flange 84 as an attachment member.

[2-1. Configuration of the projector]
FIG. 5 is a plan view showing a schematic configuration of the projector 10 according to the second embodiment. Specifically, FIG. 5 is a plan view in which the upper housing of the exterior housing constituting the top surface of the projector 10 is removed and viewed from the inside, similarly to FIG.
As shown in FIG. 5, in the second embodiment, the shape of the reinforcing member 214 is different from the shape of the reinforcing member 212 of the first embodiment, and the structure for attaching the optical device 70 and the projection lens 80 to the lower case 21 is different. It is only different from the said 1st Embodiment, About another structure, it is the same as that of the said 1st Embodiment.

FIG. 6 is a diagram illustrating a configuration of the optical device 70. Specifically, FIG. 6A is a diagram of the optical device 70 viewed from the light beam exit side, and FIG. 6B is a plan view of the optical device 70 viewed from above, and FIG. These are the figures which looked at the optical apparatus 70 from the incident side of red light. 6 shows a state in which the support body 76 is attached only to the R color light side as in FIG. 2, and the support body 76 is originally attached to each of the three color light sides. .
The optical device 70 includes the incident-side polarizing plate 71, the light modulation device 72, the emission-side polarizing plate 73, the cross dichroic prism 74, the heat conduction plate 75, the support 76, and the heat insulating pins 78 described in the first embodiment. A pedestal 770 having a shape different from that of the pedestal 77 described in the first embodiment is provided.
The pedestal 770 includes the upper pedestal 771 described in the first embodiment and a prism fixing plate 773 that supports and fixes the entire optical device 70.
The prism fixing plate 773 has substantially the same shape as the prism fixing plate 772 described in the first embodiment, but has a configuration in which the projection lens support portion 772B that supports and fixes the projection lens 8 is omitted. Other configurations are the same as those of the prism fixing plate 772 described in the first embodiment. That is, the optical device 70 and the projection lens 80 are not integrated as in the first embodiment, but are fixed separately to the lower case 21.

[2-2. Composition of reinforcing members]
FIG. 7 is a perspective view showing the reinforcing member 214.
Like the reinforcing member 212 of the first embodiment, the reinforcing member 214 is formed by processing a flat plate such as aluminum, and extends along the optical path forming surface (the surface along the bottom surface 211 of the lower case 21). A plurality of optical component mounting portions 211A are erected through fixing holes (not shown) to the bottom surface 211 of the lower case 21 by screws or the like (not shown) to reinforce the bottom surface 211 of the lower case 21.
As shown in FIG. 7, the reinforcing member 214 is omitted in plan view along the optical path of the integrator illumination optical system 4, the color separation optical system 5, the relay optical system 6, the field lens 79, the optical device 70, and the projection lens 80. It extends in an L shape and is formed so as to interfere with a part of the projection lens 80 in a plane.
As shown in FIG. 7, among the plurality of optical component mounting portions 211 </ b> A formed on the bottom surface 211 of the lower case 21, the reinforcing member 214 includes an optical component mounting portion 211 </ b> A to which the field lens 79 is mounted, and an incident side lens. A plurality of holes 214A are formed through which the optical component attaching portion 211A to which 61 is attached can be inserted.
Further, in this reinforcing member 214, on one end side of the L-shape, as shown in FIG. 7, a positioning hole 214B through which the convex portion 772A1 (FIG. 6) of the optical device 70 is inserted at the installation position of the optical device 70. And a fixing hole 214C for the optical device 70 are formed.
Further, in the reinforcing member 214, a hole 214D for attaching the projection lens 80 and a positioning hole 214E for positioning the projection lens 80 are provided on the downstream side of the positioning holes 214B and 214C in the optical path, as shown in FIG. Is formed.

[2-3. Mounting structure of optical device and projection lens]
FIG. 8 is a view showing a structure for attaching the optical device 70 and the projection lens 80 to the lower case 21.
Similar to the projection lens 8 described in the first embodiment, the projection lens 80 has a combined lens in which a plurality of lenses are combined, and the combined lens is housed and held in a lens barrel 81. As shown in FIG. 8, the lens barrel 81 is provided with a flange 84 at the light beam incident side end.
As shown in FIG. 8, the flange 84 is formed in a substantially L shape when viewed from the side. One end of the L shape is connected to the light beam incident side end of the lens barrel 81, and the other end of the L shape is a reinforcing member. It abuts on the upper surface of 214. At the other end of the flange 84, there are fixing holes 84A (FIG. 5) for fixing the projection lens 80 to the reinforcing member 214, and positioning protrusions 84B for positioning the projection lens 80 with respect to the reinforcing member 214. Is formed. Then, as shown in FIG. 8, the positioning projection 84B of the flange 84 is fitted into the positioning hole 214E of the reinforcing member 214 to position the projection lens 80 at a predetermined position with respect to the reinforcing member 214, and the fixing hole 84A ( The projection lens 80 is fixed to the reinforcing member 214 by inserting the screw 85 through FIG. 6) and screwing the screw 85 into the hole 214 </ b> D of the reinforcing member 214.
Further, as shown in FIG. 8, the convex portion 772A1 (FIG. 6) of the optical device 70 is inserted into the positioning hole 214B (FIG. 7) of the reinforcing member 214 so that the optical device 70 is positioned. The optical device 70 is fixed to the reinforcing member 214 by screwing a screw (not shown) into a hole 214C (FIG. 7) for fixing the hole and the reinforcing member 214 (not shown).

As described above, the shape of the reinforcing member 214 is formed in an approximately L shape in plan view, and the projection lens 80 is formed to extend so as to interfere with a part of the projection lens 80 in a plan view. The prism fixing plate 773 has a structure in which the projection lens support portion 772B in the prism fixing plate 772 described in the first embodiment can be omitted, thereby reducing the weight of the optical device 70 and eventually the projector 1. Can be made lighter.
Further, by forming the reinforcing member 214 so as to extend below the optical device 70 and also below the projection lens 80, the light beam emitted from the light source device 3 causes the optical components 4 to 6, 79. Not only heat but also heat generated in the optical device 70 can be dissipated to the reinforcing member 214 via the prism fixing plate 773, so that the cooling efficiency of the entire projector 1 can be improved.
Furthermore, the projection lens 80 can be fixed to the reinforcing member 214 only by deforming the flange 82 of the projection lens 8 described in the first embodiment into a substantially L shape in plan view like the flange 84 described above. The member for fixing to the reinforcing member 214 can be omitted. Therefore, the weight of the projector 1 can be reduced and the cost of the projector 10 can be reduced.

[3. Modification of Embodiment]
Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In each of the above embodiments, the outer case 2 is composed of two bodies, the lower case 21 and the upper case, and the plurality of optical component mounting portions 211A stand up from the bottom surface 211 of the lower case 21, but the present invention is not limited thereto. Further, it may be configured to stand up from the top surface of the upper case. At this time, if the reinforcing members 212 and 214 are attached to the top surface of the upper case, the rigidity of the upper case can be enhanced.
Further, the exterior case 2 is not limited to the two-body configuration of the lower case 21 and the upper case, but may be configured to include a side housing that forms the side surface. Furthermore, the shape of the lower case 21 and the shape of the upper case are not limited to the shapes described in the above embodiments. For example, the lower case 21 may have a lid shape that forms only the bottom surface 211, and the upper case may have a container shape that forms the top surface and side surfaces.

In each of the above-described embodiments, the plurality of optical component mounting portions 211A are formed with the groove-shaped broken portions 211A2. However, the present invention is not limited thereto, and the plurality of optical component mounting portions 211A can be broken. The shape of the broken portion 211A2 may be another shape. In addition, if the plurality of optical component attachment portions 211A are formed so as to be breakable, the breakage portion 211A2 may not be formed.
In each of the embodiments described above, the material of the reinforcing members 212 and 214 is not limited to aluminum, and may be a member having thermal conductivity and having a strength capable of enhancing the rigidity of the lower case 21. For example, as this material, for example, as this material, Al, Mg, Ti, alloys thereof, Invar, iron-nickel alloys such as 42Ni-Fe, metals such as carbon steel, brass, stainless steel, or carbon fiber Examples thereof include resins mixed with carbon fillers such as carbon nanotubes (polycarbonate, polyphenylene sulfide, liquid crystal resin, etc.). Similarly, the material of the light shielding member 213 is not limited to aluminum but may be any member having a light shielding property. For example, the above-described materials that can be used for the reinforcing members 212 and 214 can be applied.

In each of the above-described embodiments, a configuration in which a light shielding member is further provided so as to close the opening portion on the upper side of the light shielding member 213 may be employed. For example, corresponding to the light shielding member 213 attached to the bottom surface of the lower case 21, a light shielding member is attached to the back side of the upper case, and the upper side of the light shielding member 213 is combined with the lower case 21 and the upper case. It is good also as a structure which the said light-shielding member block | closes an opening part. Further, the light shielding member may be directly attached to the upper opening portion of the light shielding member 213. In such a configuration, the light spreading in the direction along the optical path forming surface can be blocked by the light blocking member 213, and the light traveling in the direction orthogonal to the optical path forming surface can also be blocked by the light blocking member.
Further, the light shielding member 213 is not limited to the configuration attached to the bottom surface 211 of the lower case 21 but may be configured to be attached to the upper case.

  In the embodiments, the shapes of the reinforcing members 212 and 214 are not limited to the shapes described in the embodiments. For example, in the first embodiment, the reinforcing member 212 has a shape corresponding to a region surrounded by the plurality of optical component mounting portions 211A (inside the plurality of optical component mounting portions 211A). A hole similar to the hole 214 </ b> A of the reinforcing member 214 of the second embodiment may be formed and extended to the outside of the optical component mounting portion 211 </ b> A. In the second embodiment, the reinforcing member 214 may have a shape that planarly interferes with a part of the projection lens 80 and may have a shape that extends more greatly along the optical path forming surface.

In the above-described embodiments, the projectors 1 and 10 using the three light modulation devices 72 have been described, but the present invention is not limited to this. For example, the present invention can be applied to a projector using only one light modulation device, a projector using two light modulation devices, or a projector using four or more light modulation devices.
In each of the embodiments described above, the optical path from the light source device 3 to the projection lenses 8 and 80 has a substantially L-shaped shape in plan view, but other shapes may be employed, for example, in plan view. It may be U-shaped.

In each of the embodiments, a liquid crystal panel is used as the light modulation device. However, a light modulation element other than liquid crystal such as a device using a micromirror may be used.
In each of the above embodiments, a transmission type light modulation device having a different light incident surface and light emission surface is used, but a reflection type light modulation device having the same light incident surface and light emission surface may be used. .
In each of the embodiments described above, only the example of the front type projector that performs projection from the direction of observing the screen has been described. However, in the present invention, the rear type projector that performs projection from the opposite side to the direction of observing the screen is also described. Applicable.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  The projector of the present invention is useful as a projector used in fields such as presentations and home theaters because it can reduce costs and improve the recycling rate.

FIG. 2 is a plan view showing a schematic configuration of the projector according to the first embodiment. The figure which shows the structure of the optical apparatus in the said embodiment. The disassembled perspective view which shows schematic structure of the lower case in the said embodiment. The figure which shows the broken part of the optical component attachment part in the said embodiment. FIG. 6 is a plan view showing a schematic configuration of a projector according to a second embodiment. The figure which shows the structure of the optical apparatus in the said embodiment. The perspective view which shows the reinforcement member in the said embodiment. The figure which shows the attachment structure to the lower case of the optical apparatus and projection lens in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,10 ... Projector, 2 ... Outer case (outer case), 3 ... Light source device, 8, 80 ... Projection lens (projection optical device), 21 ... Lower case (upper housing) Body), 72 ... light modulation device, 84 ... flange (attachment member), 211 ... bottom surface, 211A ... optical component attachment portion, 212, 214 ... reinforcing member, 213 ... light shielding Element.

Claims (6)

A light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, a plurality of optical components that guide the light beam emitted from the light source device to the light modulation device, and the light A projector comprising: a projection optical device that magnifies and projects a light beam modulated by a modulation device; and the light source device, the light modulation device, the plurality of optical components, and an exterior housing that houses the projection optical device. There,
The exterior housing is a molded product made of synthetic resin, and includes an upper housing constituting the top surface of the projector and a lower housing constituting the bottom surface of the projector,
The projector, wherein the upper casing or the lower casing is formed with a plurality of optical component mounting portions that stand up toward the inside of the exterior casing and to which the plurality of optical components are mounted. The projector according to claim 1, wherein
The light source device, the plurality of optical components, the light modulation device, and a light shielding member that is orthogonal to an optical path forming surface formed by a light beam passing through the projection optical device and shields light that is off the optical path. A projector characterized by that. In the projector according to claim 1 or 2,
The light source device, the plurality of optical components, the light modulation device, and an optical path forming surface formed by a light beam passing through the projection optical device, are installed on an end surface where the plurality of optical component mounting portions stand. And a reinforcing member that reinforces the upper casing or the lower casing. The projector according to claim 3, wherein
The reinforcing member is formed to extend so as to planarly interfere with a part of the projection optical device,
The projector, wherein the projection optical device is attached to the reinforcing member via an attachment member for attaching the projection optical device. In the projector according to claim 3 or 4,
The projector is characterized in that the reinforcing member is composed of a heat conductive member. The projector according to any one of claims 1 to 5,
The plurality of optical components are bonded and fixed to the plurality of optical component mounting portions,
The projector according to claim 1, wherein the plurality of optical component mounting portions are configured to be breakable.

Images