JP6155960B2 - Projector and projector manufacturing method - Google Patents

Description

  The present invention relates to a projector and a method for manufacturing the projector.

  Conventionally, an illumination device having a light source, a light modulation device that modulates light emitted from the illumination device according to image information, and a projector including a projection optical system that projects light modulated by the light modulation device are known. Yes. In addition, there has been proposed a projector that uses a semiconductor laser as a light source and includes two illumination devices for increasing the brightness (see, for example, Patent Document 1).

In the two illumination devices described in Patent Document 1, in one illumination device, blue light emitted from a semiconductor laser is diffused and emitted by a transmission type diffusing unit, and in the other illumination device (second illumination device). Is configured to irradiate the phosphor layer with light emitted from a semiconductor laser and to emit light including red light and green light from the phosphor layer.
By the way, in order to increase the contrast ratio of the projected image, a variable aperture that adjusts the amount of light passing through is used.

JP 2012-47996 A

  However, in the technique described in Patent Document 1, in the case of a projector in which a variable aperture is provided in a projection optical system or the like, the divergence angles of the lights emitted from the two illumination devices are different. Depending on the degree of light transmission (F value (F-number)), the difference in the amount of light between the blue light emitted from the projection optical system, the red light, and the green light becomes large, and the white balance of the projected image becomes large. There is a risk of collapse and uneven color.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 In the projector according to this application example, the first light source device that emits the first color light having the first divergence angle and the first color light emitted from the first light source device are incident. A first pickup optical system, an adjustment mechanism that adjusts a distance between the first light source device and the first pickup optical system, and a second divergence angle A second illumination optical system comprising: a second light source device that emits second color light; and a second pickup optical system that receives the second color light emitted from the second light source device; Image light is formed by modulating the first color light emitted from the first illumination optical system and the second color light emitted from the second illumination optical system in accordance with an image signal. A light modulation device; a projection optical system that projects the image light; and a projection optical system provided in the projection optical system. , Characterized in that it comprises a variable throttle for adjusting the amount of transmitted light, a.

Here, the divergence angle refers to an angle at which the color light emitted from the light source device spreads with respect to the optical axis of the pickup optical system.
According to this configuration, the projector includes the two illumination optical systems, and the projection optical system is provided with the variable diaphragm, so that an image with an increased contrast ratio can be projected onto a projection surface such as a screen.
In addition, since the first illumination optical system is provided with an adjustment mechanism, the first pickup optical is adjusted by adjusting the distance between the first light source device and the first pickup optical system by the adjustment mechanism. The divergence angle of the first color light emitted from the system can be changed. Thereby, the light quantity of the 1st color light which passes a variable stop can be adjusted. Thus, even if the first light source device and the second light source device having different divergence angles are provided, the variable aperture can be adjusted by adjusting the distance between the first light source device and the first pickup optical system. The ratio between the amount of the first color light that passes through and the amount of the second color light that passes through the variable aperture can be set to a desired value. Therefore, the projector according to the present invention can project an image with a good balance between the first color light and the second color light.

  Application Example 2 In the projector according to the application example described above, the adjustment mechanism holds the light source device holding unit that holds the first light source device, the first pickup optical system, and the first pickup. A pickup optical system holding portion that is movable relative to the light source device holding portion in a direction along the optical axis of the optical system, and a distance between the first light source device and the first pickup optical system are fixed. And a fixing portion.

  According to this configuration, the pickup optical system holding unit that holds the first pickup optical system is configured to be movable in a direction along the optical axis of the first pickup optical system. The distance from the first pickup optical system can be adjusted. In addition, since the adjustment mechanism includes a fixing portion (for example, an adhesive or a screw), after adjusting the distance between the first light source device and the first pickup optical system, the distance can be fixed. it can. Therefore, a projector including an adjustment mechanism that can be arranged with a simple structure and space saving can be provided.

  Application Example 3 In the projector according to the application example described above, the first light source device emits light and emits light emitted from the light emitting unit, thereby irradiating the first light source device with the first divergence angle. An optical element that emits the first color light, and the adjustment mechanism holds the light emitting part holding part and the optical axis of the first pickup optical system while holding the optical element. A moving portion that is movable relative to the light emitting portion holding portion in a direction along the direction, and a fixing portion that fixes a distance between the first light source device and the first pickup optical system. preferable.

  According to this configuration, the first light source device uses, for example, light emitted from a light emitting unit having a light emitting element such as a semiconductor laser or a light emitting diode as first color light having a first divergence angle by the optical element. Eject. As the optical element, a phosphor that emits light by light emitted from the light emitting unit, a light diffusing member that diffuses light emitted from the light emitting unit, or the like can be used. The optical element is held by the moving unit and is configured to be movable relative to the light emitting unit holding unit that holds the light emitting unit. Accordingly, the distance between the first light source device and the first pickup optical system is adjusted with a simple structure and space saving compared to the configuration in which the entire first light source device and the entire first pickup optical system are moved. Configuration is possible.

  Application Example 4 In the projector according to the application example described above, it is preferable that the first color light is blue light and the second color light is color light including green light.

  According to this configuration, the adjustment mechanism can adjust the amount of blue light that passes through the variable aperture according to the intensity of green light that passes through the variable aperture. As a result, the amount of blue light that contributes less to the brightness than the green light is adjusted while effectively using the green light that contributes to the brightness of the projected image. Therefore, the projector can project an image with good white balance while suppressing a decrease in brightness.

  Application Example 5 In the projector according to the application example described above, a third light source device that emits third color light having a third divergence angle, and the third color light emitted from the third light source device are incident. And a third illumination optical system comprising: a third pickup optical system that adjusts a distance between the third light source device and the third pickup optical system; It is preferable that the color light is blue light, the second color light is green light, and the third color light is red light.

  According to this configuration, since the first illumination optical system and the third illumination optical system include the adjustment mechanism, the amount of blue light passing through the variable aperture and the amount of red light passing through the variable aperture are reduced. Can be adjusted. That is, it is possible to individually adjust the amounts of blue light passing through the variable aperture and red light passing through the variable aperture according to the intensity of the green light passing through the variable aperture. As a result, it is possible to adjust the amounts of blue light and red light, which have a lower rate of contribution to brightness than green light, while effectively using green light that has a higher rate of contribution to the brightness of the projected image. it can. Therefore, the projector can project an image with better white balance while suppressing a decrease in brightness.

  Application Example 6 A projector manufacturing method according to this application example includes a first light source device that emits first color light having a first divergence angle, and the first light source device emitted from the first light source device. A first illumination optical system including a first pickup optical system on which colored light is incident; a second light source device that emits second colored light having a second divergence angle; and the second light source device. A second illumination optical system that includes the second pickup optical system on which the emitted second color light is incident; the first color light emitted from the first illumination optical system; and A light modulation device that forms image light by modulating the second color light emitted from the second illumination optical system according to an image signal, a projection optical system that projects the image light, and a projection optical system. Manufacturing method of a projector provided with a variable diaphragm for adjusting a passing light amount Of the first color light emitted from the first illumination optical system, the light quantity of the component passing through the variable stop, and the second color light emitted from the second illumination optical system. Of these, the method has a step of adjusting an interval between the first light source device and the first pickup optical system so that a ratio of a light amount of a component passing through the variable aperture to a predetermined value. .

  According to this configuration, in the projector manufacturing method, the light amount of the component that passes through the variable stop in the first color light emitted from the first illumination optical system and the second light emitted from the second illumination optical system. A step of adjusting the distance between the first light source device and the first pickup optical system so that the ratio of the light amount of the component of the color light to the light amount of the component passing through the variable stop becomes a predetermined value. Therefore, a projector capable of projecting an image with a good balance between the first color light and the second color light can be provided.

1 is a schematic diagram showing an optical system of a projector according to a first embodiment. The schematic diagram which shows the 1st illumination optical system in 1st Embodiment. The schematic diagram for demonstrating the state of B light inject | emitted from the 1st light source device in 1st Embodiment. The figure for demonstrating the relationship between the 1st and 2nd divergence angle in 1st Embodiment, and the light quantity inject | emitted from a projection lens. FIG. 6 is a schematic diagram illustrating a state of light emitted from the first pickup optical system when the pickup optical system holding unit in the first embodiment is moved. The graph which shows the relationship of the relative value of the light quantity inject | emitted from the projection lens with respect to F value at the time of changing the separation distance in 1st Embodiment. FIG. 10 is a schematic diagram illustrating a projector optical system according to a second embodiment. Sectional drawing which shows typically the 1st illumination optical system in the projector which concerns on 3rd Embodiment.

(First embodiment)
Hereinafter, the projector according to the first embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates light emitted from the two illumination optical systems according to image information, and enlarges and projects the modulated light onto a projection surface such as a screen.

[Configuration of optical system]
FIG. 1 is a schematic diagram showing an optical system of a projector 1000 according to this embodiment.
As shown in FIG. 1, the projector 1000 includes a first illumination optical system 100, a first integrator optical system 110, a second illumination optical system 200, a second integrator optical system 310, and a color separation light guide optical system 400. , Field lenses 450R, 450G, and 450B, a liquid crystal light valve 500R, a liquid crystal light valve 500G, a liquid crystal light valve 500B, a cross dichroic prism 600, and a projection lens 700 as a projection optical system. In the projection lens 700, a variable diaphragm 710 is provided. Although illustration is omitted, the projector 1000 includes a control unit that controls the operation of the projector 1000, a power supply device that supplies power to each device, a cooling device that cools the optical system and the power supply device, and these devices inside. An exterior housing is provided for storage. In addition, the liquid crystal light valve 500R, the liquid crystal light valve 500G, and the liquid crystal light valve 500B constitute a light modulation device according to the present invention.

The first illumination optical system 100 includes a first light source device 101, a first pickup optical system 60, and an adjustment mechanism 70.
The first light source device 101 includes a light emitting unit 20 that emits light, a collimator lens array 30, a condensing optical system 40, and a light diffusing unit 50, and blue light (hereinafter referred to as “B light”) as first color light. ).

As shown in FIG. 1, the light emitting unit 20 includes a plurality of light emitting elements 24 and a substrate 22 on which the plurality of light emitting elements 24 are mounted.
The light emitting element 24 is composed of a semiconductor laser that emits B light.
Although detailed description is omitted, the substrate 22 has a function of mediating supply of electric power to the light emitting element 24, a function of radiating heat generated in the light emitting element 24, and the like.

  The collimator lens array 30 includes a plurality of lenses 32 corresponding to the plurality of light emitting elements 24, and substantially parallelizes the light emitted from the plurality of light emitting elements 24, respectively.

  The condensing optical system 40 condenses the light from the collimator lens array 30. The light emitted from the condensing optical system 40 is applied to the light diffusion unit 50. In FIG. 1, the condensing optical system 40 is shown as a single lens, but it may be constituted by a plurality of lenses. In addition, the position of the condensing optical system 40 (at least one lens in the case of a plurality of lenses) can be adjusted in two directions orthogonal to each other in a plane orthogonal to the optical axis of the condensing optical system 40. You may comprise as follows. As a result, the position of the light incident on the light diffusion unit 50 can be adjusted. As a result, it is possible to make the optical axis of the illumination optical system 100 coincide with the optical axis of the integrator optical system 110, and it is possible to improve the light propagation efficiency and improve the image quality by reducing the illuminance unevenness in the vertical and horizontal directions.

  The light diffusing unit 50 has a plurality of microlenses and is irradiated with light from the condensing optical system 40. The light diffusing unit 50 emits B light (first color light) at a first divergence angle. The light diffusing unit 50 corresponds to an optical element.

  The first pickup optical system 60 includes a first lens 62 and a second lens 64, and changes the direction of light emitted from the light diffusing unit 50 at the first divergence angle, thereby changing the first integrator optical system 110. Eject. The number of lenses constituting the first pickup optical system 60 is not limited to two, and may be one or three or more.

  The adjustment mechanism 70 has a function of adjusting the interval (separation distance) between the first light source device 101 and the first pickup optical system 60 by moving the first pickup optical system 60. The divergence angle of the B light emitted from the first pickup optical system 60 is adjusted by adjusting the separation distance. Thereby, the amount of B light shielded by the variable stop 710 of the projection lens 700 can be adjusted. In other words, the adjustment mechanism 70 emits light from the projection lens 700 in accordance with the light amount of the component that passes through the variable stop 710 in the light emitted from the second illumination optical system 200 at a predetermined F value of the projection lens 700. It is comprised so that the light quantity of B light to be adjusted can be adjusted. The adjustment mechanism 70 will be described in detail later.

  As shown in FIG. 1, the first integrator optical system 110 includes a first lens array 120, a second lens array 130, a polarization conversion element 140, and a superimposing lens 150.

The first lens array 120 has a plurality of first lenses 122 and divides the light from the first pickup optical system 60 into a plurality of partial light beams.
The second lens array 130 is disposed on the light exit side of the first lens array 120 and has a plurality of second lenses 132 that face the plurality of first lenses 122. The second lens array 130, together with the superimposing lens 150, superimposes the partial light beam on the liquid crystal light valve 500B.
The polarization conversion element 140 converts non-polarized light emitted from the second lens array 130 into linearly polarized light.

As shown in FIG. 1, the second illumination optical system 200 includes a second light source device 201 and a second pickup optical system 260.
The second light source device 201 includes a light emitting unit 220, a collimator lens array 230, a condensing optical system 240, and a fluorescent light emitting unit 250, and includes red light (hereinafter referred to as “R light”) and green light (hereinafter referred to as “G light”). ”). The G light corresponds to the second color light.

The light emitting unit 220 includes a plurality of light emitting elements 224 and a substrate 222 on which the plurality of light emitting elements 224 are mounted.
The light emitting element 224 is formed of a semiconductor laser that emits blue light (for example, emission intensity peak: about 440 nm) as excitation light. Note that the light emitting element 224 may be the same as the light emitting element 24 in the first light source device 101. Further, not only blue light but also an element that emits light in a wavelength band including violet light or ultraviolet light may be used as the light-emitting element 224.
Similar to the substrate 22, the substrate 222 has a function of mediating supply of electric power to the light emitting element 224, a function of radiating heat generated in the light emitting element 224, and the like.

Similar to the collimator lens array 30, the collimator lens array 230 includes a plurality of lenses 232 corresponding to the plurality of light emitting elements 224, and substantially parallelizes the light emitted from the plurality of light emitting elements 224, respectively.
The condensing optical system 240 condenses the light from the collimator lens array 230 in the same manner as the condensing optical system 40. Light from the condensing optical system 40 is applied to the fluorescent light emitting unit 250. As with the condensing optical system 40, the condensing optical system 240 may be configured with a plurality of lenses. Similarly to the condensing optical system 40, the condensing optical system 240 (at least in the case of a plurality of lenses is used in two directions orthogonal to each other in a plane orthogonal to the optical axis of the condensing optical system 240. The position of one lens) may be adjustable.

The fluorescent light emitting unit 250 includes a transparent member 252 and a phosphor layer 254.
The transparent member 252 is formed in a plate shape with optical glass such as quartz glass.
The phosphor layer 254 is provided on the transparent member 252 and emits light including R light and G light by excitation light from the light emitting element 224 emitted through the collimator lens array 230 and the condensing optical system 240. . The phosphor layer 254 is made of a layer containing, for example, a YAG (Yttrium Aluminum Garnet) phosphor (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce. The fluorescent layer may be composed of a layer containing another YAG phosphor, or a layer containing a phosphor other than the YAG phosphor (for example, a silicate phosphor or a TAG phosphor). It may consist of. Further, it comprises a layer containing a mixture of a phosphor that converts excitation light into R light (for example, CaAlSiN3 red phosphor) and a phosphor that converts excitation light into G light (for example, β sialon green phosphor). It may be a thing.

  The second pickup optical system 260 includes a first lens 62 and a second lens 64 that are common to the first pickup optical system 60, and substantially parallelizes the light emitted from the fluorescent light emitting unit 250 to provide a second integrator. The light is emitted to the optical system 310.

  Similar to the first integrator optical system 110, the second integrator optical system 310 includes a first lens array 320, a second lens array 330, a polarization conversion element 340, and a superimposing lens 350. The light from the pickup optical system 260 is divided into a plurality of partial lights, and the divided partial lights are superimposed on the liquid crystal light valves 500G and 500R.

The color separation light guide optical system 400 includes a dichroic mirror 410 and reflection mirrors 420, 430, and 440, a function of guiding the B light from the first illumination optical system 100 to the liquid crystal light valve 500B, and a second illumination. The light from the optical system 200 is separated into R light and G light, and each color light is guided to the liquid crystal light valves 500R and 500G to be illuminated.
The field lenses 450R, 450G, and 450B are disposed on the light incident side of the liquid crystal light valves 500R, 500G, and 500B, respectively.

The B light emitted from the first integrator optical system 110 is reflected by the reflection mirror 440 and enters the liquid crystal light valve 500B through the field lens 450B.
The dichroic mirror 410 reflects the G light out of the light emitted from the second integrator optical system 310 and transmits the R light.
The G light reflected by the dichroic mirror 410 is reflected by the reflection mirror 420 and enters the liquid crystal light valve 500G via the field lens 450G.
The R light transmitted through the dichroic mirror 410 is reflected by the reflection mirror 430 and enters the liquid crystal light valve 500R through the field lens 450R.

Although not shown in detail, the liquid crystal light valves 500R, 500G, and 500B are each arranged on a transmission type liquid crystal panel, an incident side polarizing plate disposed on the light incident side of the liquid crystal panel, and a light emission side of the liquid crystal panel. The exit side polarizing plate is provided.
The liquid crystal light valves 500R, 500G, and 500B have a rectangular image forming area in which a plurality of micro pixels (not shown) are provided in a matrix, and each pixel is set to a light transmittance corresponding to image information. Then, the liquid crystal light valves 500R, 500G, and 500B modulate each incident color light according to the image information, and emit it to the cross dichroic prism 600 as image light of each color light.

  The cross dichroic prism 600 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. In the cross dichroic prism 600, the dielectric multilayer film reflects the R light and B light image light emitted from the liquid crystal light valves 500R and 500B, and transmits the G light image light emitted from the liquid crystal light valve 500G. The image light of each color light is synthesized and emitted.

The projection lens 700 includes a plurality of lenses (not shown), and enlarges and projects the light combined by the cross dichroic prism 600 onto a projection surface such as a screen SC.
Although the detailed drawing is omitted, the variable diaphragm 710 is disposed in the projection lens 700 and adjusts the amount of light passing therethrough. The variable stop 710 has an opening centered on the optical axis 700C of the projection lens 700, and the opening area of the opening is changed by a driving unit such as a motor (not shown) based on an instruction from the control unit. The drive unit is configured to change the aperture area of the variable diaphragm according to the image information based on the instruction from the control unit. The variable diaphragm is configured to include a plurality of light shielding members, and adjusts the amount of incident light passing therethrough by changing the aperture area. Specifically, in the case of image information of a bright image, the variable aperture is driven so as to increase the opening area of the opening, and the amount of passing light is increased, and in the case of image information of a dark image, the variable aperture is Driven to reduce the aperture area, the amount of light passing through is reduced. As a result, the image projected from the projection lens 700 is an image with an increased contrast ratio.

[Adjustment mechanism]
Here, the adjustment mechanism 70 will be described in detail.
FIG. 2 is a schematic diagram showing the first illumination optical system 100. Specifically, FIG. 2A is a plan view of the first illumination optical system 100, and FIG. 2B is a perspective view of the adjustment mechanism 70 provided in the first illumination optical system 100. In FIG. 2, the X-axis direction is a direction parallel to the optical axis 60 </ b> C of the first pickup optical system 60. Further, a plane parallel to the bottom surface portion 711 described later is defined as an XY plane. The positive direction of the Z axis is the upward direction, and the negative direction of the Z axis is the downward direction.

As shown in FIG. 2, the adjustment mechanism 70 includes a pickup optical system holding unit 71 that holds the first pickup optical system 60, a light source device holding unit 72 that holds the first light source device 101, and adhesion as a fixing unit. An agent 73 is provided.
The pickup optical system holding portion 71 has a bottom surface portion 711 positioned below the first pickup optical system 60 and side surface portions 712 that stand upward from both side end portions of the bottom surface portion 711 extending in the X-axis direction. ing. A concave portion 713 is formed on the outer surface side of the side surface portion 712.
The first lens 62 and the second lens 64 are held by the pickup optical system holding unit 71 by inserting both end portions into a groove (not shown) provided in the side surface portion 712.

  The light source device holding portion 72 includes a bottom surface portion 721 that extends from below the bottom surface portion 711 of the pickup optical system holding portion 71 toward the first light source device 101, and side surface portions 712 on both sides of the pickup optical system holding portion 71. It has a side surface portion 722 that is provided outside and rises upward from the bottom surface portion 721.

  The pickup optical system holding unit 71 is incorporated in the light source device holding unit 72 so that the movement in the direction orthogonal to the optical axis 60C is restricted by the side surface unit 722 and can move in the direction along the optical axis 60C. That is, the pickup optical system holding unit 71 and the light source device holding unit 72 are configured to be relatively movable in the direction along the optical axis 60C. The distance between the first light source device 101 and the first pickup optical system 60 is adjusted by moving the pickup optical system holding unit 71 relative to the light source device holding unit 72.

  The adhesive 73 is filled between the pickup optical system holding unit 71 and the light source device holding unit 72 from the recess 713 after the distance between the first light source device 101 and the first pickup optical system 60 is adjusted. The pickup optical system holding unit 71 is fixed to the light source device holding unit 72.

  By adjusting the distance between the first light source device 101 and the first pickup optical system 60, the divergence angle of the B light emitted from the first pickup optical system 60 is adjusted. As a result, the amount of the component of the B light emitted from the first pickup optical system 60 that passes through the variable stop 710 provided in the projection lens 700 is changed. That is, as described above, the adjustment mechanism 70 is configured to be able to adjust the amount of B light emitted from the projection lens 700 at a predetermined F value of the projection lens 700.

Here, a change in the amount of light passing through the variable stop 710 due to the adjustment of the distance between the first light source device 101 and the first pickup optical system 60 will be described.
First, the state of the B light emitted from the first light source device 101 will be described.
FIG. 3 is a schematic diagram for explaining the state of B light emitted from the first light source device 101, and FIG. 3A is emitted from the first light source device 101 to the first pickup optical system 60. FIG. 5B is a diagram showing the intensity distribution of B light emitted from the first pickup optical system 60. FIG. 3A shows only the light diffusing unit 50 in the first light source device 101 in order to make it easy to recognize light rays. In the first pickup optical system 60, FIG. It is the figure which substituted and showed the 2nd lens 64 with one lens.

The light emitted from the first light source device 101, that is, the B light emitted from the light diffusion unit 50, has a first divergence angle α1 with respect to the optical axis 60C, as shown in FIG. Then, it is emitted to the first pickup optical system 60.
As shown in FIG. 3A, when the first pickup optical system 60 is positioned so that the light diffusing unit 50 is in focus, the light emitted from the first pickup optical system 60 is light. It becomes parallel to the axis 60C.

As shown in FIG. 3B, the intensity of the light emitted from the first pickup optical system 60 becomes maximum at the center (position of the optical axis 60C) and decreases as the distance from the center increases.
Although illustration is omitted, similarly, light emitted from the second light source device 201, that is, light including G light and R light emitted from the fluorescent light emitting unit 250 has a second divergence angle α2. Then, the light is emitted to the second pickup optical system 260.

Next, the relationship between the amount of light emitted from the projection lens 700 and the divergence angle will be described.
FIG. 4 is a diagram for explaining the relationship between the amount of light emitted from the projection lens 700 and the divergence angle, and illustrates the case where the first divergence angle α1 is smaller than the second divergence angle α2 (α1 <α2). FIG. Specifically, FIG. 4A shows a light intensity distribution at the first divergence angle α1, FIG. 4B shows a light intensity distribution at the second divergence angle α2, and FIG. (C) is a graph showing the relationship of the relative value of the amount of light emitted from the projection lens 700 with respect to the F value when F value = F2 is 100%.

  As shown in FIGS. 4A and 4B, the intensity distribution of light having a large divergence angle, for example, G light emitted from the second light source device 201 (fluorescent light emitting unit 250) is light having a small divergence angle, For example, it becomes wider than the intensity distribution of B light emitted from the first light source device 101 (light diffusion unit 50). Further, for example, the shaded areas in FIGS. 4A and 4B are areas shielded by the variable diaphragm 710 when the F value = F2.

  Here, when the variable aperture 710 is operated to change the F value, the amount of light decreases as the F value increases (the aperture area of the variable aperture 710 decreases) as shown in FIG. In addition, the light emitted from the second light source device 201 having a large divergence angle is shielded by the variable diaphragm 710 more than the light emitted from the first light source device 101 having a small divergence angle, so that projection is performed. The rate of decrease in the amount of light emitted from the lens 700 increases.

Next, a case where the pickup optical system holding unit 71 is moved with respect to the light source device holding unit 72 and the interval (separation distance) between the first light source device 101 and the first pickup optical system 60 is changed will be described. .
FIG. 5 is a schematic diagram for explaining a state of light emitted from the first pickup optical system 60 when the pickup optical system holding unit 71 is moved. Specifically, FIG. 5A is a diagram illustrating the spread of the B light emitted from the first pickup optical system 60, and FIG. 5B is a diagram illustrating the B light emitted from the first pickup optical system 60. It is a figure which shows intensity distribution. FIG. 5A shows only the light diffusing unit 50 in the first light source device 101 in order to make it easy to recognize light rays. In the first pickup optical system 60, the first lens 62 and It is the figure which substituted and showed the 2nd lens 64 with one lens.

As shown in FIG. 5A, when the first pickup optical system 60 is positioned so as to be focused on the light diffusing unit 50 (separation distance L ₀ ), the light is emitted from the first pickup optical system 60. The emitted light S ₀ is parallel to the optical axis 60C.

When the first pickup optical system 60 is brought close to the light diffusion unit 50 from the state of the separation distance L ₀ (separation distance L ₁ ), the light S ₁ emitted from the first pickup optical system 60 is from the light S ₀ . It ejaculates so that it may spread.
On the other hand, when the first pickup optical system 60 is moved away from the light diffusion unit 50 from the state of the separation distance L ₀ (separation distance L ₂ ), the light S ₂ emitted from the first pickup optical system 60 is the light S _2. Injection in a direction narrower than ₀ .
That is, the intensity distribution of the B light emitted from the first pickup optical system 60 becomes wider as the separation distance becomes smaller, as shown in FIG.

FIG. 6 is a graph showing the relationship of the relative value of the amount of light emitted from the projection lens 700 with respect to the F value when the separation distance is changed, and is a graph when F value = F2 is set to 100%. In FIG. 6, the curve indicated by L _1, the distance corresponds to the case of L _1, the curve shown in L _2, the distance corresponds to the case of L _2.
As shown in FIG. 6, if the separation distance is the same, the amount of light decreases as the F value increases (the opening area of the variable diaphragm 710 decreases), as described with reference to FIG. To do.
When the separation distance is changed, the amount of light shielded by the variable diaphragm 710 is larger when the separation distance is smaller than when the separation distance is larger. Therefore, the rate of decrease in the amount of light emitted from the projection lens 700 is increased.
That is, by adjusting the position of the first pickup optical system 60 so that the F value is constant, the separation distance is increased when the light amount is increased, and the separation distance is decreased when the light amount is decreased. The amount of B light emitted from the projection lens 700 can be adjusted. In the present embodiment, the case where the first divergence angle α1 is smaller than the second divergence angle α2 (α1 <α2) has been described as an example. However, the first divergence angle α1 is greater than the second divergence angle α2. In the case of a large value (α1> α2), it is possible to adjust similarly.

Here, a method for adjusting the position of the first pickup optical system 60 will be specifically described.
The bottom surface portion 711 of the pickup optical system holding portion 71 and the bottom surface portion 721 of the light source device holding portion 72 are provided with holes (not shown).

  First, a jig is inserted into the hole of the bottom surface portion 711 of the pickup optical system holding portion 71 from below the light source device holding portion 72.

Next, the brightness of the B light (first color light) and the brightness of the G light (second color light) projected from the projection lens 700 onto the screen SC are measured at the F value that is the reference for adjustment. In the present embodiment, for example, F2.5 is used as the F value serving as a reference at the time of adjustment.
Next, in the F value at the time of adjustment, the brightness of the B light and the brightness of the G light projected from the projection lens 700 onto the screen SC are set to a predetermined ratio of the brightness when the F value is a reference. In this way, the pickup optical system holding unit 71 is moved relative to the light source device holding unit 72 by moving the jig inserted into the hole of the bottom surface unit 711. In other words, the adjustment mechanism 70 has the first light source device 101 and the first light source device 101 so that the ratio of the amount of B light emitted from the projection lens to the amount of G light approaches the ratio in the case of the reference F value. The distance from the pickup optical system 60 is adjusted. In the present embodiment, for example, F4.8 is used as the F value during adjustment. The brightness of the G light in the case of F4.8 was about 55% of the brightness of the G light in the case of the reference F value. Therefore, the predetermined ratio is set to 55%, and the brightness of the B light in the case of F4.8 is approximately 55% of the brightness of the B light in the case of the reference F2.5. The distance between the light source device 101 and the first pickup optical system 60 is adjusted.

Specifically, when the brightness of the B light projected on the screen SC exceeds a predetermined ratio, the pickup optical system holding unit 71 is moved in a direction approaching the first light source device 101, and a predetermined amount When the ratio falls below, the pickup optical system holding unit 71 is moved away from the first light source device 101.
After the adjustment, an adhesive is filled between the side surface portion 712 and the side surface portion 722 from the recess 713 to fix the pickup optical system holding portion 71 to the light source device holding portion 72. The distance between the first light source device 101 and the first pickup optical system 60 is fixed.

  As described above, the projector 1000 is manufactured by the light amount of the component that passes through the variable stop 710 in the B light (first color light) emitted from the first illumination optical system 100 and the second illumination optical system 200. The first light source device 101 and the first light source device 101 are arranged so that the ratio of the G light (second color light) emitted from the light beam of the component passing through the variable stop 710 approaches the ratio in the case of the reference F value. And a step of adjusting the distance from the one pickup optical system 60.

  As described above, the projector 1000 is provided with the adjustment mechanism 70 in the first illumination optical system 100 of the two illumination optical systems (the first illumination optical system 100 and the second illumination optical system 200). Manufactured by a manufacturing method.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The projector 1000 includes two illumination optical systems (the first illumination optical system 100 and the second illumination optical system 200), and the projection lens 700 is provided with a variable stop 710. The enhanced image can be projected on a projection surface such as a screen.
Further, since the first illumination optical system 100 is provided with the adjusting mechanism 70, the first illumination optical system 100 passes through the variable stop 710 by adjusting the distance between the first light source device 101 and the first pickup optical system 60. The amount of B light (first color light) to be adjusted can be adjusted. As a result, even when the first light source device 101 and the second light source device 201 having different divergence angles are provided, the distance between the first light source device 101 and the first pickup optical system 60 is adjusted. Thus, the ratio of the amount of B light passing through the variable stop 710 and the amount of G light (second color light) passing through the variable stop 710 can be set to a predetermined value. Therefore, the projector can project an image with a good balance between the B color light, the G light, and the R light.

  (2) The adjustment mechanism 70 adjusts the amount of B light emitted from the second light source device 201 and passing through the variable diaphragm 710 in accordance with the intensity of G light passing through the variable diaphragm 710. Thus, while effectively using G light that contributes to the brightness of the projected image, the amount of B light that contributes less to the brightness than G light is adjusted. Makes it possible to project an image with good white balance while suppressing a decrease in brightness.

  (3) The adjustment mechanism 70 is configured so that the pickup optical system holding unit 71 can move in the direction along the optical axis 60C with respect to the light source device holding unit 72, and the first light source device 101 and the first pickup optical system. The space | interval with 60 is adjusted and the state adjusted with the adhesive agent 73 as a fixing | fixed part is maintained after adjustment. Accordingly, it is possible to provide the projector 1000 including the adjustment mechanism 70 that can be arranged with a simple structure and space saving.

  (4) In the projector manufacturing method, the light amount of the component that passes through the variable stop in the first color light emitted from the first illumination optical system and the second color light emitted from the second illumination optical system Since there is a step of adjusting the distance between the first light source device and the first pickup optical system so that the ratio of the light quantity of the component passing through the variable aperture to a predetermined value, the first A projector capable of projecting an image with a good balance between the color light and the second color light can be provided.

(Second Embodiment)
Hereinafter, a projector according to a second embodiment will be described with reference to the drawings. In the following description, the same components and the same members as those of the projector 1000 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.

FIG. 7 is a schematic diagram showing an optical system of a projector 2000 according to the second embodiment.
The projector 1000 of the first embodiment includes two illumination optical systems (a first illumination optical system 100 and a second illumination optical system 200), but the projector 2000 of the present embodiment has three illumination optical systems. It has. Specifically, the projector 2000 emits G light as the second color light in addition to the first illumination optical system 100 that emits B light as the first color light provided in the projector 1000 of the first embodiment. And a third illumination optical system 2300 for emitting R light as the third color light.

The first integrator optical system 110, the second integrator optical system 310, and the third integrator optical system 510 are arranged on the light emission side of the first to third illumination optical systems 100, 2200, and 2300. Yes. The third integrator optical system 510 is configured similarly to the second integrator optical system 310.
Further, the projector 2000 according to the present embodiment is configured not to include the color separation light guide optical system 400 included in the projector 1000 according to the first embodiment.

As shown in FIG. 7, the second illumination optical system 2200 includes a second light source device 2210 and a second pickup optical system 260.
The second light source device 2210 includes a fluorescent light emitting unit 2250 that is different from the fluorescent light emitting unit 250 in the second light source device 201 of the first embodiment.

The fluorescent light emitting unit 2250 includes a transparent member 2251 and a phosphor layer 2252.
The transparent member 2251 is formed in a plate shape with optical glass such as quartz glass.
The phosphor layer 2252 is provided on the transparent member 2251, and emits G light at a second divergence angle by the excitation light emitted from the light emitting element 224 via the collimator lens array 230 and the condensing optical system 240. The phosphor layer 2252 is formed of a green phosphor (for example, a material containing Ba ₃ Si ₆ O ₁₂ N ₂ : Eu).

As shown in FIG. 7, the third illumination optical system 2300 includes a third light source device 2310, a third pickup optical system 360 configured similarly to the second pickup optical system 260, and an adjustment mechanism 170. .
The third light source device 2310 includes a light emitting unit 220, a collimator lens array 230, a condensing optical system 240, and a fluorescent light emitting unit 2350.

The fluorescent light emitting unit 2350 includes a transparent member 2351 and a phosphor layer 2352.
The transparent member 2351 is formed in a plate shape with optical glass such as quartz glass.
The phosphor layer 2352 is provided on the transparent member 2351, and emits R light at a third divergence angle by the excitation light emitted from the light emitting element 224 via the collimator lens array 230 and the condensing optical system 240. The phosphor layer 2352 is formed of a red phosphor (for example, a material containing CaAlSiN ₃ —Si ₂ N ₂ O: Eu).

  The adjustment mechanism 170 is configured in the same manner as the adjustment mechanism 70 in the first illumination optical system 100, and the third pickup optical system 360 is placed on the optical axis 360C with respect to the third light source device 2310 (fluorescent light emitting unit 2350). The distance between the third light source device 2310 and the third pickup optical system 360 is adjusted.

  In the first illumination optical system 100, the adjustment method as described in the first embodiment is used to adjust the amount of the component that passes through the variable stop 710 in the G light emitted from the second illumination optical system 2200. Thus, the distance between the first light source device 101 and the first pickup optical system 60 is adjusted. Similarly, in the third illumination optical system 2300, the third light source device 2310 and the third light source device 2310 are connected to the third light source device 2310 according to the amount of the component of the G light emitted from the second illumination optical system 2200 that passes through the variable stop 710. The distance from the pickup optical system 360 is adjusted.

As described above, the projector 2000 according to the present embodiment includes the first to third illumination optical systems 100, 2200, and 2300 that respectively emit three color lights (B light, G light, and R light), and the adjustment mechanism 70, With 170, the amount of B light and the amount of R light emitted from the projection lens 700 can be adjusted in accordance with the amount of G light emitted from the projection lens 700.
As a result, the light amount of the component that passes through the variable stop 710 in the B light emitted from the first illumination optical system 100 and the variable light 710 in the R light emitted from the third illumination optical system 2300 pass. The ratio between the light amount of the component and the component that passes through the variable stop 710 in the G light emitted from the second illumination optical system 2200 can be set to a predetermined value.

As described above, according to the projector of the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
(1) In the projector 2000, the first illumination optical system 100 and the third illumination optical system 2300 include the adjustment mechanisms 70 and 170, so that they are emitted from the second light source device 2210 and the variable diaphragm 710 is moved. In accordance with the amount of G light that passes, the amount of B light and the amount of R light that pass through the variable stop 710 can be individually adjusted. This makes it possible to adjust the light amounts of the B light and the R light, which have a lower rate of contribution to the brightness than the G light, while effectively using the G light that contributes to the brightness of the projected image. Therefore, the projector 2000 can project an image with better white balance while suppressing a decrease in brightness.

  (2) The color separation light guide optical system 400 is not necessary, and the first to third illumination optical systems 100, 2200, and 2300 are configured to have a common member, so that the optical system of the projector 2000 is small. And the number of components can be reduced.

(Third embodiment)
Hereinafter, a projector according to a third embodiment will be described with reference to the drawings. In the following description, the same components and the same members as those of the projector 1000 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
The adjustment mechanism 70 according to the first embodiment is configured to be able to move the first pickup optical system 60 with respect to the first light source device 101. However, the first illumination optical system 2400 according to the present embodiment includes the first illumination optical system 2400. The optical diffusion unit 50 is configured to be movable with respect to the pickup optical system 60.

FIG. 8 is a cross-sectional view schematically showing the first illumination optical system 2400 in the projector of this embodiment.
As shown in FIG. 8, the first illumination optical system 2400 includes the first light source device 101, the first pickup optical system 60, and the adjustment mechanism 70 in the first illumination optical system 100 of the first embodiment. Different adjustment mechanisms 270 are provided.
As described in the first embodiment, the first light source device 101 includes the light emitting unit 20, the collimator lens array 30, the condensing optical system 40, and the light diffusing unit 50.

The adjustment mechanism 270 includes a light emitting unit holding unit 271, a moving unit 272, and a screw 273. The screw 273 corresponds to a fixing unit that fixes the moving unit 272 to the light emitting unit holding unit 271.
The light emitting unit holding unit 271 has a bottom surface part 2711 and holds the light emitting unit 20, the collimator lens array 30, the condensing optical system 40, and the first pickup optical system 60.
The moving unit 272 holds the light diffusing unit 50 as an optical element, and is formed to be movable in a direction along the optical axis 60 </ b> C relative to the light emitting unit holding unit 271.
The moving part 272 has an L-shaped cross section, and has a fixing part 2721 to which the light diffusing part 50 is fixed and a support part 2722 supported by the bottom part 2711.

The support portion 2722 is formed with a long hole (not shown) whose length in the direction along the optical axis 60C is larger than the length in the direction orthogonal to the optical axis 60C. The bottom surface portion 2711 is provided with a columnar protrusion (not shown) that is inserted into the long hole of the support portion 2722.
Movement of the moving part 272 in the direction orthogonal to the optical axis 60C is restricted by the protrusion of the bottom surface part 2711, and movement in the direction along the optical axis 60C is enabled. The moving unit 272 can adjust the distance between the first pickup optical system 60 and the light diffusing unit 50 in a state where the protruding portion of the bottom surface portion 2711 is in contact with the inner surface of the long hole.

Then, after the interval between the first pickup optical system 60 and the light diffusion portion 50 is adjusted, the support portion 2722 is fixed to the bottom surface portion 2711 by the screw 273, and the adjusted interval is fixed.
In this way, by configuring the moving unit 272 to move with respect to the light emitting unit holding unit 271, the amount of the component that passes through the variable diaphragm 710 out of the B light emitted from the first illumination optical system 100 can be reduced. The first light source device 101 and the first pickup optical system so that the ratio of the amount of the G light emitted from the second illumination optical system 200 and the amount of the component passing through the variable stop 710 becomes a desired value. The distance from 60 can be adjusted.

  Although illustration is omitted, the third illumination optical system 2300 in the second embodiment can also be configured in the same manner as described above. That is, a light emitting unit holding unit that holds the light emitting unit 220, the collimator lens array 230, the condensing optical system 240, and the third pickup optical system 360, and a moving unit that holds the fluorescent light emitting unit 2350 are provided. The distance between the third light source device 2310 and the third pickup optical system 360 can be adjusted by moving the moving unit relative to the unit.

As described above, according to the projector of the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
Since the distance between the first light source device 101 and the first pickup optical system 60 is adjusted by moving the light diffusing unit 50 as an optical element, the entire first light source device 101 or the first pickup is arranged. Compared to the configuration in which the entire optical system 60 is moved, a configuration in which the distance between the first light source device 101 and the first pickup optical system 60 is adjusted with a simple structure and space saving becomes possible.

(Modification)
In addition, you may change the said embodiment as follows.
In the first embodiment, the first pickup optical system 60 is moved to adjust the distance between the first light source device 101 and the first pickup optical system 60. You may comprise so that the space | interval of the 1st light source device 101 and the 1st pick-up optical system 60 may be adjusted by moving the light source device 101. FIG.
Similarly, the second embodiment is configured to adjust the distance between the third light source device 2310 and the third pickup optical system 360 by moving the third pickup optical system 360. You may comprise so that the space | interval of the 3rd light source device 2310 and the 3rd pick-up optical system 360 may be adjusted by moving the 3rd light source device 2310. FIG.

The light source device of the embodiment includes a light emitting unit, a collimator lens array, a condensing optical system, and a light diffusing unit and a fluorescent light emitting unit configured separately. A light source device may be configured by incorporating the above function or by laminating a phosphor layer on the light emitting portion.
Further, the light emitting element included in the light emitting unit is not limited to the semiconductor laser, and for example, a light emitting diode, an organic EL (Electro Luminescence) element, or the like may be used.

In the first embodiment, the pickup optical system holding unit 71 and the light source device holding unit 72 are fixed by the adhesive 73 as a fixing unit, but the pickup optical system holding unit 71 and the light source device are held by screws as the fixing unit. You may comprise so that the part 72 may be fixed.
In the third embodiment, the moving part 272 and the light emitting part holding part 271 are fixed with a screw 273 as a fixing part, but the moving part 272 and the light emitting part holding part 271 are connected with an adhesive as a fixing part. You may comprise so that it may fix.

  In the projector according to the embodiment, a transmissive liquid crystal panel is used as a light modulation device, but a reflective liquid crystal panel may be used. Further, a micromirror type light modulation device such as a DMD (Digital Micromirror Device) may be used as the light modulation device.

  Instead of the integrator optical system in the above embodiment, a rod lens that makes incident light uniform by multiple reflection on the inner surface may be used.

  20, 220 ... Light emitting unit, 24, 224 ... Light emitting element, 50 ... Light diffusing unit, 60 ... First pickup optical system, 60C ... Optical axis, 70, 170, 270 ... Adjustment mechanism, 71 ... Pickup optical system holding unit 72 ... light source device holding portion 73 ... adhesive 100,2400 ... first illumination optical system 101 ... first light source device 200,2200 ... second illumination optical system 201,210 ... second Light source device, 250, 2250, 2350 ... Fluorescent light emitting part, 254, 2252, 2352 ... Phosphor layer, 260 ... Second pickup optical system, 271 ... Light emitting part holding part, 272 ... Moving part, 273 ... Screw, 360 ... Third pickup optical system, 360C, optical axis, 500B, 500G, 500R, liquid crystal light valve, 700, projection lens, 700C, optical axis, 1000, 2000, projection Over, 2300 ... third illumination optical system, 2310 ... third light source device.

Claims (6)

A first light source device that emits first color light having a first divergence angle; a first pickup optical system that receives the first color light emitted from the first light source device; and A first illumination optical system comprising: an adjustment mechanism for adjusting a distance between the light source device and the first pickup optical system;
A second light source device that emits second color light having a second divergence angle; and a second pickup optical system that receives the second color light emitted from the second light source device. Two illumination optical systems;
Light that forms image light by modulating the first color light emitted from the first illumination optical system and the second color light emitted from the second illumination optical system according to an image signal A modulation device;
A projection optical system for projecting the image light;
A variable aperture provided in the projection optical system for adjusting the amount of passing light;
A projector comprising: The projector according to claim 1,
The adjustment mechanism is
A light source device holding unit for holding the first light source device;
A pickup optical system holding unit that holds the first pickup optical system and is movable relative to the light source device holding unit in a direction along the optical axis of the first pickup optical system;
A fixing portion for fixing a distance between the first light source device and the first pickup optical system;
A projector comprising: The projector according to claim 1,
The first light source device includes:
A light emitting unit that emits light;
An optical element that emits the first color light at the first divergence angle by being irradiated with light emitted from the light emitting unit, and
The adjustment mechanism is
A light emitting unit holding unit for holding the light emitting unit;
A moving unit that holds the optical element and is movable relative to the light emitting unit holding unit in a direction along an optical axis of the first pickup optical system;
A fixing portion for fixing a distance between the first light source device and the first pickup optical system;
A projector comprising: It is a projector as described in any one of Claims 1-3, Comprising:
The first color light is blue light;
The projector according to claim 1, wherein the second color light is color light including green light. It is a projector as described in any one of Claims 1-3, Comprising:
A third light source device that emits third color light having a third divergence angle; a third pickup optical system that receives the third color light emitted from the third light source device; and An adjustment mechanism that adjusts the distance between the light source device and the third pickup optical system, and further includes a third illumination optical system,
The first color light is blue light;
The second color light is green light;
The projector according to claim 3, wherein the third color light is red light. A first light source device that emits first color light having a first divergence angle; and a first pickup optical system that receives the first color light emitted from the first light source device. 1 illumination optical system;
A second light source device that emits second color light having a second divergence angle; and a second pickup optical system that receives the second color light emitted from the second light source device. Two illumination optical systems;
Light that forms image light by modulating the first color light emitted from the first illumination optical system and the second color light emitted from the second illumination optical system according to an image signal A modulation device;
A projection optical system for projecting the image light;
A method of manufacturing a projector, comprising: a variable aperture provided in the projection optical system for adjusting a passing light amount;
Of the first color light emitted from the first illumination optical system, the light quantity of the component that passes through the variable aperture, and among the second color light emitted from the second illumination optical system, the variable aperture A method for manufacturing a projector, comprising: adjusting a distance between the first light source device and the first pickup optical system so that a ratio of a light amount of a component passing through the light source becomes a predetermined value. .

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