JP2012053101A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an optical axis of green laser light adjustable without complicating an attaching mechanism of a green laser light source device in an image display device using a semiconductor laser as a light source.SOLUTION: The image display device includes the green laser light source device 2 that converts a wavelength of infrared laser light to output green laser light, a spatial light modulator 5 that modulates the green laser light incident from the green laser light source device based on a video signal, a dichroic mirror 14 that is arranged on a path between the green laser light source device and the spatial light modulator, reflects the green laser light, and guides the green laser light to the spatial light modulator side, a mirror supporting device 51 that supports the dichroic mirror, and a hosing 21. The green laser light source device moves along one axis direction with respect to the housing so as to shift the optical axis of the green laser light in a first direction. The mirror supporting device rotates around the one axis while holding the dichroic mirror so as to shift the optical axis of the green laser light in a second direction crossing the first direction.

Description

  The present invention relates to an image display device including a laser light source device using a semiconductor laser as a light source.

  In recent years, a technique using a semiconductor laser as a light source of an image display device has attracted attention. This semiconductor laser has better color reproducibility, instantaneous lighting, longer life, and higher power consumption compared to mercury lamps that have been widely used in image display devices. There are various advantages such as the ability to reduce the size and the ease of miniaturization.

  As an image display device using a semiconductor laser, laser beams of three colors of red, blue and green from three laser light source devices equipped with semiconductor lasers are respectively incident on a display area of a reflective liquid crystal panel, and this reflective liquid crystal A technique for projecting image light of each color emitted from a panel onto an external screen by a projection lens is known (see, for example, Patent Document 1).

  As for the green laser light, since there is no high-power semiconductor laser that directly outputs it, an excitation laser beam is output from the semiconductor laser, and the laser medium is excited by the excitation laser light to emit an infrared laser. A technique is known in which light is output and the wavelength of the infrared laser light is converted by a wavelength conversion element to output green laser light (see, for example, Patent Document 2).

JP 2007-316393 A JP 2008-16833 A

  In the image display device described in Patent Document 1 above, in order to maintain a good image quality of an image displayed on the screen, an appropriate incident region of a spatial light modulator (here, a reflective liquid crystal panel) is appropriately selected. It is necessary to accurately adjust the optical axis (laser beam path) of the emitted light of each laser light source device so that the laser beam is incident on the position. Therefore, it is desirable that each laser light source device is provided so that the attachment position (that is, the optical axis of the emitted light) of the image display device with respect to the housing can be adjusted in at least two axial directions.

  By the way, in the green laser light source device that converts the wavelength of the infrared laser light as described in Patent Document 2 and outputs the green laser light, conversion loss occurs in the laser medium and the wavelength conversion element. It is necessary to increase the output, so that the heat generation of the semiconductor laser becomes significant. Therefore, when the green laser light source device is attached to the housing of the image display device so that the position of the green laser light source device can be adjusted in two axial directions, the mounting structure becomes complicated, and the heat generation causes the housing side to become hot. As a result, there is a problem that the adjacent red laser light source device and blue laser light source device may adversely affect the output.

  The present invention has been devised in view of such problems of the prior art, and the optical axis of the green laser light can be adjusted by a simple operation without complicating the mounting structure of the green laser light source device. It is a main object of the present invention to provide an image display apparatus.

  The image display device of the present invention is an image display device using a semiconductor laser as a light source, and converts a wavelength of infrared laser light to output green laser light, and is incident from the green laser light source device. A spatial light modulator that modulates the green laser light based on a video signal, and a path between the green laser light source device and the spatial light modulator, and reflects the green laser light to modulate the spatial light And an optical element supporting device that supports the optical element, a green laser light source device, the spatial light modulator, and a housing to which the optical element supporting device is attached. The laser light source device is capable of displacing the optical axis of the green laser light in a first direction by moving in a uniaxial direction with respect to the housing, and the optical element support device By rotating around uniaxially lifting state, characterized by a displaceable optical axis of the green laser beam in a second direction crossing the first direction.

  As described above, according to the present invention, the green laser light source device is provided so that the position of the green laser light source device can be adjusted in the uniaxial direction with respect to the casing, and the optical element is rotated around the uniaxial axis by the optical element support device. There is an excellent effect that the optical axis of the green laser light can be adjusted without complicating the mounting structure of the apparatus.

1 is a schematic configuration diagram of an image display device 1 according to a first embodiment. 1 is a perspective view of an image display device 1 according to a first embodiment. 2 is an exploded perspective view of the image display device 1 shown in FIG. The schematic diagram which shows the condition of the laser beam in the green laser light source apparatus 2 which concerns on 1st Embodiment. The perspective view which shows the periphery of the green laser light source device 2 in the image display apparatus 1 which concerns on 1st Embodiment. The perspective view of the mirror support apparatus 51 which concerns on 1st Embodiment. FIG. 6 is an exploded perspective view of the mirror support device 51 shown in FIG. The top view explaining the optical axis adjustment method of the green laser beam by the mirror support apparatus 51 which concerns on 1st Embodiment The perspective view explaining the optical axis adjustment method of the green laser beam by the mirror support apparatus 51 which concerns on 1st Embodiment. Explanatory drawing which shows the change of the projection position of the green laser beam on the screen S by the optical axis adjustment of the green laser beam which concerns on 1st Embodiment. The perspective view which shows the example which incorporated the image display apparatus 1 which concerns on 1st Embodiment in the notebook type information processing apparatus 81. FIG. The perspective view which shows the attachment structure of the green laser light source apparatus 2 of the image display apparatus 1 which concerns on 2nd Embodiment. The perspective view of the mirror support device concerning a 2nd embodiment. FIG. 13 is an exploded perspective view of the mirror support device shown in FIG.

  1st invention made | formed in order to solve the said subject is an image display apparatus which uses a semiconductor laser as a light source, Comprising: The green laser light source apparatus which converts the wavelength of infrared laser light and outputs green laser light, A spatial light modulator that modulates the green laser light incident from the green laser light source device based on a video signal; and a path between the green laser light source device and the spatial light modulator; An optical element that is reflected and guided to the spatial light modulator side, an optical element support device that supports the optical element, a housing in which the green laser light source device, the spatial light modulator, and the optical element support device are attached. The green laser light source device is capable of displacing the optical axis of the green laser light in a first direction by moving in a uniaxial direction with respect to the housing, and supporting the optical element. Location, by rotating around the uniaxial while holding the optical element, a structure in which a displaceable optical axis of the green laser beam in a second direction crossing the first direction.

  According to this, since the green laser light source device is provided so that the position of the green laser light source device can be adjusted in one axial direction with respect to the housing, and the optical element supporting device is configured to rotate the optical element around one axis, the mounting structure of the green laser light source device is It is possible to adjust the optical axis of the green laser light without making it complicated. Moreover, since the optical element support device is configured to rotate the optical element around one axis, there is also an advantage that adjustment work is easy even in the case.

  According to a second aspect of the present invention, the casing is provided with a main body that houses the spatial light modulator and the optical element support device, and protrudes from the main body, and the green laser light source device is in the uniaxial direction. It can be set as the structure which has an attaching part attached to the movably.

  According to this, it becomes possible to adjust the optical axis of the green laser light while suppressing the influence of the heat generated by the green laser light source device on the surroundings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of an image display device 1 according to the first embodiment of the present invention, and FIGS. 2 and 3 are a perspective view and an exploded perspective view of the image display device 1, respectively. The image display device 1 projects and displays a required image on a screen S. The green laser light source device 2 that outputs green laser light, the red laser light source device 3 that outputs red laser light, and the blue laser light. A blue laser light source device 4 that outputs light, a liquid crystal reflective spatial light modulator 5 that spatially modulates laser light from each of the laser light source devices 2 to 4 in accordance with a video signal, and forms an image, and each laser The polarization beam splitter 6 that reflects the laser light from the light source devices 2 to 4 and irradiates the spatial light modulator 5 and transmits the modulated laser light emitted from the spatial light modulator 5, and each laser light source device 2 to 4. A relay optical system 7 that guides the laser light emitted from the polarizing beam splitter 6, and a projection optical system 8 that projects the modulated laser light transmitted through the polarizing beam splitter 6 onto the screen S. .

  The image display device 1 displays a color image by a so-called field sequential method. Laser beams of each color are sequentially output from the laser light source devices 2 to 4 in a time-sharing manner, and an image by the laser beam of each color is generated by an afterimage. Recognized as a color image.

  The relay optical system 7 includes collimator lenses 11 to 13 that convert the laser beams of the respective colors emitted from the laser light source devices 2 to 4 into parallel beams, and the laser beams of the respective colors that have passed through the collimator lenses 11 to 13 in a predetermined direction. First and second dichroic mirrors 14 and 15, a diffusion plate 16 for diffusing the laser light guided by the dichroic mirrors 14 and 15, and a field lens for converting the laser light that has passed through the diffusion plate 16 into a convergent laser 17.

  If the side from which the laser light is emitted from the projection optical system 8 toward the screen S is the front side, the blue laser light is emitted backward from the blue laser light source device 4. The green laser light and the red laser light are emitted from the green laser light source device 2 and the red laser light source device 3 so that the optical axis of the green laser light and the optical axis of the red laser light are orthogonal to the optical axis of the blue laser light. The emitted blue laser light, red laser light, and green laser light are guided to the same optical path by the two dichroic mirrors 14 and 15. That is, the blue laser light and the green laser light are guided to the same optical path by the first dichroic mirror 14, and the blue laser light, the green laser light, and the red laser light are guided to the same optical path by the second dichroic mirror 15.

  The first and second dichroic mirrors 14 and 15 are formed with a film for transmitting and reflecting laser light having a predetermined wavelength on the surface, and the first dichroic mirror 14 transmits blue laser light. And reflects the green laser light. The second dichroic mirror 15 transmits red laser light and reflects blue laser light and green laser light.

  Each of these optical members is supported by the casing 21. The casing 21 functions as a radiator that dissipates heat generated by the laser light source devices 2 to 4 and is formed of a material having high thermal conductivity such as aluminum or copper. Further, the spatial light modulator 5, the polarization beam splitter 6, the relay optical system 7, the projection optical system 8, and the like are attached to the housing 21.

  The green laser light source device 2 is attached to a mounting plate 22 formed on the housing 21 in a state of projecting sideways from the main body 21a of the housing 21. The mounting plate 22 protrudes in a direction perpendicular to the side wall 24 from a corner where the front wall 23 and the side wall 24, which are respectively positioned in front and side of the accommodation space of the relay optical system 7, intersects the heat sink. As a function. Thereby, the heat radiation of the green laser light source device 2 is promoted, and the heat is not easily transmitted to the casing 21, so that the thermal influence on other laser light source devices can be suppressed. The red laser light source device 3 is attached to the outer surface side of the side wall portion 24 while being held by the holder 25. The blue laser light source device 4 is attached to the outer surface side of the front wall portion 23 while being held by the holder 26.

  The red laser light source device 3 and the blue laser light source device 4 are configured by a so-called CAN package, and the optical axis is positioned on the central axis of the can-shaped exterior portion with the laser chip that outputs the laser light supported by the stem. The laser beam is emitted from a glass window provided in the opening of the exterior part. The red laser light source device 3 and the blue laser light source device 4 are fixed to the holders 25 and 26 by, for example, press-fitting into mounting holes 27 and 28 provided in the holders 25 and 26. The heat generated by the laser chips of the blue laser light source device 4 and the red laser light source device 3 is transmitted to the casing 21 through the holders 25 and 26 and is radiated. Each holder 25, 26 is formed of a material having high thermal conductivity such as aluminum or copper.

  As shown in FIG. 1, the green laser light source device 2 includes a semiconductor laser 31 that outputs excitation laser light, and a FAC (Fast−) that is a condenser lens that condenses the excitation laser light output from the semiconductor laser 31. Axis Collimator) lens 32 and rod lens 33, laser medium 34 that is excited by excitation laser light to output basic laser light (infrared laser light), and half-wavelength laser light (by converting the wavelength of the basic laser light) A wavelength conversion element 35 that outputs (green laser light), a concave mirror 36 that constitutes a resonator together with the laser medium 34, a glass cover 37 that prevents leakage of the excitation laser light and the fundamental wavelength laser light, and the respective parts. The base 38 and the cover body 39 which covers each part are provided.

  The green laser light source device 2 is attached to the housing 21 by fixing the base 38 to the mounting plate 22 with a plurality of fastening screws (not shown). As shown in FIG. 3, three screw holes 91 are formed on the front surface 38 a side of the base 38 of the green laser light source device 2. The mounting plate 22 of the housing 21 is provided with through holes 92 at positions corresponding to the screw holes 91 of the base 38. The fastening screws are fitted into the screw holes 91 in a state of being inserted through the respective through holes 92. As shown in FIG. 1, the front surface 38a of the base 38 is in contact with the mounting surface 22a of the mounting plate 22, so that heat conduction from the green laser light source device 2 to the mounting plate 22 is promoted and a heat dissipation effect is obtained. Rise. In FIG. 3, two guide pins 93 provided so as to protrude from the base 38 toward the mounting plate 22 are inserted into two guide holes 94 formed in the mounting plate 22, respectively. The green laser light source device 2 can be easily aligned with respect to.

  In FIG. 1, a gap G <b> 1 having a required width (for example, 0.5 mm or less) is formed between the green laser light source device 2 and the side wall portion 24 of the housing 21. This makes it difficult for the heat of the green laser light source device 2 to be transmitted to the red laser light source device 3, suppresses the temperature rise of the red laser light source device 3, and allows the red laser light source device 3 with poor temperature characteristics to operate stably. Can do. Further, in order to secure a required optical axis adjustment allowance (for example, about 0.3 mm) of the red laser light source device 3, a required width (for example, 0.3 mm or more) is provided between the green laser light source device 2 and the red laser light source device 3. ) G <b> 2.

  Further, in the red laser light source device 3 attached to the housing 21, the front surface 25 a of the holder 25 positioned on the red laser light emission side contacts the side wall portion 24. As shown in FIG. 3, the diameters of the two mounting through holes 96 formed in the holder 25 are set to be larger than the outer diameter of the shaft portion of the fixing bolt 97. Each fixing bolt 97 is fitted into a bolt hole (not shown) provided in the side wall portion 24 of the housing 21 while being inserted through the through hole 96. With such a configuration, the mounting position of the holder 25 can be adjusted in any direction (for example, up and down and front and rear biaxial directions) within the range allowed by the clearance between the shaft portion of the fixing bolt 97 and the through hole 96. As a result, the optical axis of the red laser light (that is, the projection position with respect to the screen) can be displaced in an arbitrary direction.

  Note that the blue laser light source device 4 is the same as that of the red laser light source device 3 described above, and the fixing bolt 97 is inserted into a through hole (not shown) formed in the holder 26, and It fits in a bolt hole 98 provided in the front wall portion 23 of the body 21. Therefore, the mounting position of the holder 26 can be adjusted in an arbitrary direction similarly to the holder 25, and as a result, the optical axis of the blue laser light can be displaced in an arbitrary direction.

  FIG. 4 is a schematic diagram showing the state of laser light in the green laser light source device 2. The laser chip 41 of the semiconductor laser 31 outputs excitation laser light having a wavelength of 808 nm. The FAC lens 32 reduces the spread of the first axis of the laser light (the direction orthogonal to the optical axis direction and along the drawing sheet). The rod lens 33 reduces the spread of the slow axis of laser light (in the direction orthogonal to the drawing sheet).

The laser medium 34 is a so-called solid laser crystal, and is excited by excitation laser light having a wavelength of 808 nm that has passed through the rod lens 33 and outputs a fundamental wavelength laser light (infrared laser light) having a wavelength of 1064 nm. This laser medium 34 is obtained by doping Nd (neodymium) into an inorganic optically active substance (crystal) made of Y (yttrium) VO ₄ (vanadate), and more specifically, Y of YVO _{4 as} a base material. Is doped with Nd ⁺³ which is an element that emits fluorescence.

  On the side of the laser medium 34 facing the rod lens 33, a film 42 having a function of preventing reflection of excitation laser light having a wavelength of 808 nm and high reflection of laser light having a fundamental wavelength of 1064 nm and half-wavelength laser light having a wavelength of 532 nm. Is formed. On the side of the laser medium 34 facing the wavelength conversion element 35, a film 43 having an antireflection function for the fundamental wavelength laser beam having a wavelength of 1064 nm and the half wavelength laser beam having a wavelength of 532 nm is formed.

  The wavelength conversion element 35 is a so-called SHG (Second Harmonics Generation) element, which converts the wavelength of a fundamental wavelength laser beam (infrared laser beam) having a wavelength of 1064 nm output from the laser medium 34 to generate a half-wavelength laser beam having a wavelength of 532 nm. (Green laser light) is generated. This wavelength conversion element 35 is provided with a periodic polarization reversal structure in which a region where polarization is reversed and a region as it is are alternately formed in a ferroelectric crystal. A fundamental wavelength laser beam is incident in the arrangement direction. As the ferroelectric crystal, for example, a material obtained by adding MgO to LN (lithium niobate) is used.

  On the side of the wavelength conversion element 35 facing the laser medium 34, a film 44 having functions of preventing reflection of the fundamental wavelength laser beam having a wavelength of 1064 nm and highly reflecting the half wavelength laser beam having a wavelength of 532 nm is formed. On the side facing the concave mirror 36 in the wavelength conversion element 35, a film 45 having an antireflection function for the fundamental wavelength laser beam having a wavelength of 1064 nm and the half wavelength laser beam having a wavelength of 532 nm is formed.

  The concave mirror 36 has a concave surface on the side facing the wavelength conversion element 35, and this concave surface has a function of high reflection with respect to a fundamental wavelength laser beam with a wavelength of 1064 nm and antireflection with respect to a half wavelength laser beam with a wavelength of 532 nm. A film 46 is formed. As a result, the fundamental wavelength laser beam having a wavelength of 1064 nm resonates and is amplified between the film 42 of the laser medium 34 and the film 46 of the concave mirror 36.

  In the wavelength conversion element 35, a part of the fundamental wavelength laser light having a wavelength of 1064 nm incident from the laser medium 34 is converted into a half-wavelength laser light having a wavelength of 532 nm and passed through the wavelength conversion element 35 without being converted. The laser beam is reflected by the concave mirror 36 and is incident on the wavelength conversion element 35 again, and is converted into a half-wavelength laser beam having a wavelength of 532 nm. The half-wavelength laser light having a wavelength of 532 nm is reflected by the film 44 of the wavelength conversion element 35 and is emitted from the wavelength conversion element 35.

  Here, the laser beam B1 incident on the wavelength conversion element 35 from the laser medium 34, changed in wavelength by the wavelength conversion element 35, and emitted from the wavelength conversion element 35, and the wavelength conversion element once reflected by the concave mirror 36. When the laser beam B2 that is incident on 35 and reflected by the film 44 and emitted from the wavelength conversion element 35 causes interference, the output decreases. Therefore, the wavelength conversion element 35 is tilted with respect to the optical axis direction so that the laser light beams B1 and B2 do not interfere with each other due to refraction, thereby avoiding a decrease in output.

  The glass cover 37 shown in FIG. 1 is formed with a film that does not transmit these laser beams in order to prevent the excitation laser beam having a wavelength of 808 nm and the fundamental wavelength laser beam having a wavelength of 1064 nm from leaking to the outside. ing.

  FIG. 5 is a perspective view showing the periphery of the green laser light source device 2, and FIGS. 6 and 7 are a perspective view and an exploded perspective view of the mirror support device 51, respectively. Here, for convenience of explanation, as shown in FIGS. 6 and 7, the thickness direction of the first dichroic mirror 14 is the front-rear direction, and the height direction (extension direction of the first rotation shaft 63) is the vertical direction. The width direction (extension direction of the second rotation shaft 73) is the left-right direction.

  In FIG. 6, a mirror support device 51 that supports the first dichroic mirror 14 includes a first support member 53 that is displaceably attached to the bottom wall portion 52 of the housing 21, and the first support member 53. The second support member 54 is mounted so as to be displaceable.

  The first support member 53 is a flat plate-like base portion 61 slidably placed on the upper surface of the bottom wall portion 52, and above the center portion of the upper surface of the base portion 61 (that is, orthogonal to the base portion 61. And a square flat plate-like standing portion 62 provided so as to protrude in the direction).

  In the base portion 61, one of the two portions separated from the upright portion 62 as a boundary has a lower portion from the lower surface (that is, a direction orthogonal to the base portion 61), as shown in FIGS. 6 and 7. The first rotation shaft 63 is provided so as to protrude toward the head. The first rotation shaft 63 is inserted into a shaft hole (not shown) opened on the upper surface of the bottom wall portion 52, whereby the first support member 53 can be rotated around the first rotation shaft 63. ing. In addition, in the base portion 61, a portion different from the portion where the first rotation shaft 63 is provided among the two portions divided by the standing portion 62 as a boundary is a predetermined centered on the first rotation shaft 63. A long hole 65 is formed along the arc. The position adjustment screw 66 for fixing the first support member 53 at a required rotational position is fitted into a screw hole 67 that is opened in the upper surface of the bottom wall portion 52 while being inserted through the elongated hole 65.

  The second support member 54 includes a substantially rectangular flat plate-like main body 71 that slidably overlaps with one side surface of the upright portion 62 of the first support member 53. A mirror mounting portion 72 to which the first dichroic mirror 14 is mounted is provided on the opposite side of the main body portion 71 from the standing portion 62. The mirror mounting portion 72 has a peripheral edge of the first dichroic mirror 14 (here, so as not to inhibit at least the reflection of the green laser on the reflection surface 14a (see FIG. 1) and the transmission of the blue laser on the incident surface 14b (see FIG. 1)). Then, a part of the right edge and the upper edge) is supported.

  As shown in FIG. 7, the main body 71 is provided with a second rotation shaft 73 that protrudes in a direction orthogonal to the upright portion 62 on the upright portion 62 side of the first support member 53. The second rotation shaft 73 is inserted into a shaft hole 74 formed in the upright portion 62, so that the second support member 54 can rotate around the second rotation shaft 73. Further, a long hole 75 is formed in the standing portion 62 along a predetermined arc centered on the second rotation shaft 73. The position adjustment screw 76 that fixes the second support member 54 at a required rotational position is fitted into a screw hole 77 that is opened on the right side surface of the main body 71 while being inserted through the elongated hole 75.

  The first dichroic mirror 14 has a rectangular flat plate shape, and is fixed to the second support member 54 in a state of being orthogonal to the base portion 61 of the first support member 53 and the main body portion 71 of the second support member 54. As shown in FIG. 6, the first dichroic mirror 14 is arranged such that the center axis C1 of the first rotation shaft 63 passes through the center in the front-rear direction and the center in the left-right direction, and the center in the front-rear direction. And it arrange | positions so that the center axis line C2 of the 2nd rotating shaft 73 may penetrate the center of an up-down direction.

  FIGS. 8 and 9 are a plan view and a perspective view, respectively, for explaining a method of adjusting the optical axis of the green laser light by the mirror support device 51, and FIG. 10 shows the green laser light on the screen S by adjusting the optical axis of the green laser light. It is explanatory drawing which shows the change of a projection position.

  In the adjustment of the optical axis of the green laser beam, first, the first support member 53 is rotated around the first rotation shaft 63 while the second support member 54 is fixed, as indicated by an arrow A in FIG. This turning operation is performed by once loosening the position adjusting screw 66. Here, the length of the long hole 65 in the longitudinal direction is set according to the rotation range required for the optical axis adjustment of the green laser light in order to facilitate the optical axis adjustment work. The rotation of the first support member 53 is restricted by the shaft portion of the position adjusting screw 66 coming into contact with one of the two end edges in the longitudinal direction of the long hole 65.

  The angle of the reflecting surface 14a of the first dichroic mirror 14 with respect to the optical axis of the green laser light is changed by the rotation operation of the first support member 53. As a result, as indicated by the two-dot chain line in FIG. 8, the green laser light Lg emitted from the green laser light source device 2 is reflected in the horizontal direction (the direction along the paper surface of FIGS. 1 and 8) (angle). ) Is changed. Due to the change in the reflection direction of the green laser light, the path of the green laser light (such as the incident position of the green laser light with respect to the spatial light modulator 5) changes. As a result, as shown in FIG. The laser light (more specifically, the position of the image based on the green laser light projected on the screen S) can be displaced in the left-right direction (the direction along the paper surface of FIG. 1). By adjusting the optical axis of the green laser light (here, adjustment of the rotational position of the first support member 53), the green laser light is brought to an appropriate position in the left-right direction (usually the center in the left-right direction) on the screen S. Can project.

  Next, as shown by an arrow B in FIG. 9, the second support member 54 is rotated around the second rotation shaft 73. This turning operation is performed by once loosening the position adjusting screw 76. Here, the length of the long hole 75 in the longitudinal direction is set in accordance with the rotation range required for the optical axis adjustment of the green laser light in order to facilitate the optical axis adjustment work. The rotation of the second support member 54 is restricted by the shaft portion of the position adjusting screw 76 coming into contact with one of the two end edges in the longitudinal direction of the long hole 75.

  The angle of the reflecting surface 14a of the first dichroic mirror 14 with respect to the optical axis of the green laser light is changed by the rotation operation of the second support member 54. As a result, as indicated by a two-dot chain line in FIG. 9, the reflection direction of the green laser light Lg in the vertical direction (the direction orthogonal to the paper surface of FIG. 1) is changed. As a result of the change in the reflection direction of the green laser light, the path of the green laser light is changed. As a result, as shown in FIG. 10, the green laser light on the screen S is vertically moved (the direction perpendicular to the paper surface of FIG. 1). Can be displaced. By adjusting the optical axis of the green laser light (here, the rotational position of the second support member 54 is adjusted), the green laser light is brought to an appropriate position in the left-right direction on the screen S (usually the center in the left-right direction). Can project.

  As described above, in the image display device according to the first embodiment, the first dichroic mirror 14 is rotated around the first rotation shaft 63 and the second rotation shaft 73 by the mirror support device 51, so that the green laser beam is emitted. Since the reflection direction is changed, the green laser light source device 2 does not require adjustment of the mounting position unlike the red laser light source device 3 and the blue laser light source device 4, and the optical axis of the green laser light can be adjusted. It becomes possible.

  The optical axis adjustment of the green laser light source device 2 as described above needs to be performed at least before the optical axis adjustment of the blue laser light source device 4 (adjustment of the attachment position of the holder 26). This is to prevent the displacement of the first dichroic mirror 14 from affecting the refraction angle of the blue laser light passing therethrough. Further, the optical axis adjustment of the red laser light source device 3 (adjustment of the mounting position of the holder 25) is performed before the optical axis adjustment of the green laser light source device 2 and the optical axis adjustment of the green laser light source device 2 and the blue laser light source device 4. It can be implemented during or after the optical axis adjustment of the blue laser light source device 4.

  FIG. 11 is a perspective view showing an example in which the image display device 1 is built in a notebook information processing device 81. In the housing 82 of the information processing device 81, a housing space in which the image display device 1 is retractable is formed on the back side of the keyboard, and the image display device 1 is housed in the housing 82 when not in use. In use, the image display device 1 is pulled out from the housing 82, and the image display device 1 is rotated at a required angle with respect to the base portion 83 that rotatably supports the image display device 1, whereby the image is displayed. Laser light from the display device 1 can be projected onto the screen.

  In the above example, the laser chip 41, the laser medium 34, and the wavelength conversion element 35 of the green laser light source device 2 are respectively the excitation laser beam having a wavelength of 808 nm and the fundamental wavelength laser beam (infrared laser beam) having a wavelength of 1064 nm. In addition, although half-wavelength laser light (green laser light) having a wavelength of 532 nm is output, the present invention is not limited to this. The laser light finally outputted from the green laser light source device 2 may be anything that can be recognized as green. For example, it is preferable to output laser light in a wavelength region in which the peak wavelength is in the range of 500 nm to 560 nm.

(Second Embodiment)
FIG. 12 is a perspective view showing a mounting structure of the green laser light source device 2 of the image display device 1 according to the second embodiment of the present invention, and FIGS. 13 and 14 are perspective views of the mirror support device 51 according to the second embodiment, respectively. It is a figure and an exploded perspective view. 12 to 14, the same components as those in the first embodiment are denoted by the same reference numerals. Further, regarding the second embodiment, matters not specifically mentioned below are the same as those in the first embodiment, and detailed description thereof is omitted.

  As shown in FIG. 12, in the mounting plate 22 of the housing 21, the through-holes 92 disposed at positions corresponding to the screw holes 91 of the base 38 are at least green laser light emitted from the green laser light source device 2. It is provided as a long hole extending in a uniaxial direction (here, the vertical direction) intersecting with the optical axis. The fastening screw 93 of the green laser light source device 2 is fitted into the screw hole 91 in a state of being inserted through each through hole 92.

  In the above configuration, the mounting position of the green laser light source device 2 can be adjusted in one axial direction (vertical direction) within a range that the clearance between the shaft portion of the fastening screw 93 and the through hole 92 allows, The optical axis of the green laser light can be displaced (in this case, translated) in the vertical direction (first direction orthogonal to the paper surface of FIG. 1). As a result, the same effect as the horizontal angle change of the reflecting surface 14a in the dichroic mirror 14 described above with reference to FIG. 9 is obtained, and the green laser light on the screen S is displaced in the vertical direction as described above with reference to FIG. It becomes possible.

  As shown in FIGS. 13 and 14, the mirror support device 51 that supports the first dichroic mirror 14 is a flat base portion slidably placed on the upper surface of the bottom wall portion of the housing. 101 and a mirror mounting portion 102 provided so as to protrude upward from the central portion of the upper surface of the base portion 101.

  A first rotation shaft 63 is provided from the bottom of the base 101 so as to protrude in a direction perpendicular to the lower surface thereof. A central axis C1 of the first rotation shaft 63 passes through the center in the front-rear direction and the center in the left-right direction of the first dichroic mirror 14. The first rotation shaft 63 is inserted into a shaft hole (not shown) that opens on the upper surface of the bottom wall portion of the housing, whereby the mirror support device 51 can rotate around the first rotation shaft 63. It has become. Although not shown in FIG. 13, a long hole similar to the long hole 65 in FIG. 6 described above is provided behind the first dichroic mirror 14 in the base portion 101 (see the long hole 65 in FIGS. 6 and 7). The mirror support device 51 can be fixed at a required rotational position by tightening a position adjusting screw similar to the position adjusting screw 66 in FIG.

  Since the reflection direction of the green laser light is changed by the turning operation of the mirror support device 51, the optical axis of the green laser light can be displaced in the left-right direction (second direction along the plane of FIG. 1). it can. As a result, the same effect as the vertical angle change of the reflecting surface 14a in the dichroic mirror 14 described above with reference to FIG. 8 is obtained, and the green laser light on the screen S is displaced in the left-right direction as described above with reference to FIG. It becomes possible.

  As described above, in the image display device according to the second embodiment, the green laser light source device 2 is provided so that the position of the green laser light source device 2 can be adjusted in the uniaxial direction with respect to the housing 21, and the first dichroic mirror 14 is provided by the mirror support device 51. Since it is configured to rotate around one rotation axis 63, the optical axis of the green laser light can be adjusted without complicating the mounting structure of the green laser light source device 2. Further, since the mirror support device 51 is configured to rotate the first dichroic mirror 14 around one axis, it is not necessary to operate the two position adjusting screws 66 and 67 as in the case of the first embodiment. There is also an advantage that adjustment work is easy even in the narrow housing 21.

  Although the present invention has been described based on specific embodiments, these embodiments are merely examples, and the present invention is not limited to these embodiments. For example, in the first embodiment, the first rotation shaft and the second rotation shaft in the mirror support device extend in any direction as long as at least the optical axis of the green laser light can be adjusted in the same manner as described above. And need not be orthogonal to each other. It should be noted that all the components of the image display device according to the present invention shown in the above-described embodiments are not necessarily essential, and can be appropriately selected as long as they do not depart from the scope of the present invention.

  An image display device according to the present invention includes a laser light source device that can adjust the optical axis of green laser light with a simple operation without complicating the mounting structure of the green laser light source device, and uses a semiconductor laser as a light source. It is useful as an image display device.

DESCRIPTION OF SYMBOLS 1 Image display apparatus 2 Green laser light source apparatus 3 Red laser light source apparatus 4 Blue laser light source apparatus 5 Spatial light modulator 14 1st dichroic mirror (optical element)
15 Second dichroic mirror 21 Housing 21a Main body 22 Mounting plate (mounting portion)
51 Mirror support device (optical element support device)
53 1st support member 54 2nd support member 63 1st rotation axis 73 2nd rotation axis S Screen

An image display device according to the present invention is an image display device using a semiconductor laser as a light source, and converts a wavelength of an infrared laser beam excited by the semiconductor laser that outputs the excitation laser beam and the excitation laser beam. A green laser light source device having at least a wavelength conversion element for outputting green laser light and a resonator for resonating the infrared laser light, and modulating the green laser light incident from the green laser light source device based on a video signal A spatial light modulator, an optical element disposed in a path between the green laser light source device and the spatial light modulator, and reflecting the green laser light and guiding it to the spatial light modulator side, and the optical element An optical element supporting device for supporting the green laser light source device, the green laser light source device, the spatial light modulator, and a housing to which the optical element supporting device is attached. Location, in the mounting position to the housing, by moving in one axial direction intersecting the optical axis of the green laser light output from the green laser light source device, the optical axis of the first of the green laser beam The optical element support device is pivotable with respect to the housing by a pivot shaft provided in either the housing or the optical element support device and a shaft hole provided in the other. The optical axis of the green laser beam can be displaced in a second direction intersecting the first direction by rotating freely around the rotation axis while being freely attached and holding the optical element. It is characterized by that.

A first invention made to solve the above-described problem is an image display device using a semiconductor laser as a light source, a semiconductor laser that outputs excitation laser light, and an infrared excited by the excitation laser light A green laser light source device having at least a wavelength conversion element that converts the wavelength of the laser light and outputs green laser light; a resonator that resonates the infrared laser light; and the green laser incident from the green laser light source device A spatial light modulator that modulates light based on a video signal, and a path between the green laser light source device and the spatial light modulator, reflects the green laser light and guides it to the spatial light modulator side. An optical element, an optical element support device that supports the optical element, a green laser light source device, the spatial light modulator, and a housing to which the optical element support device is attached. , The green laser light source device, the at mounting position of the housing, by moving in one axial direction intersecting the optical axis of the green laser light output from the green laser light source device, the light of the green laser beam The shaft is displaceable in a first direction, and the optical element support device includes a rotation shaft provided in either the case or the optical element support device and a shaft hole provided in the other case. A second direction that intersects the optical axis of the green laser light with the first direction by rotating about the rotation axis while holding the optical element. To be displaceable.

Claims (2)

An image display device using a semiconductor laser as a light source,
A green laser light source device that converts the wavelength of infrared laser light and outputs green laser light;
A spatial light modulator that modulates the green laser light incident from the green laser light source device based on a video signal;
An optical element that is disposed in a path between the green laser light source device and the spatial light modulator, and reflects the green laser light and guides the green laser light to the spatial light modulator side;
An optical element support device for supporting the optical element;
A housing to which the green laser light source device, the spatial light modulator, and the optical element support device are attached;
The green laser light source device is capable of displacing the optical axis of the green laser light in a first direction by moving in a uniaxial direction with respect to the housing.
The optical element support device is configured to be able to displace the optical axis of the green laser light in a second direction intersecting the first direction by rotating around one axis while holding the optical element. An image display device characterized by the above.   The housing includes a main body portion that houses the spatial light modulator and the optical element support device, and an attachment in which the green laser light source device is attached to be movable in the uniaxial direction while projecting from the main body portion. The image display device according to claim 1, further comprising: a display unit.

Images