JP2012098579A - Collimater lens unit, luminaire and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a collimator lens unit without any deterioration of light use efficiency due to the increase of the ratio of light radiated at a great angle among the light radiated to a region to be radiated.SOLUTION: A collimator lens unit 20 provided with a first lens 22 and a second lens 24 makes light emitted from a solid light source device 10 of a Lambert light emission type approximately parallel. In this case, a preceding stage aspherical surface formed on an incident surface 25 of the second lens 24 includes a flux density distribution conversion function for converting to a prescribed flux density distribution and a subsequent stage aspherical surface formed on an emission surface 26 of the second lens 24 includes a function for making the light from the preceding stage aspherical surface approximately parallel. The flux density in the vicinity of an optical axis in the collimator lens unit 20 in the light emitted from the collimator lens unit 20 is made higher than the flux density in the periphery section which is separated from the optical axis of the collimator lens unit 20.

Description

  The present invention relates to a collimator lens unit, an illumination device, and a projector.

  2. Description of the Related Art Conventionally, a collimator lens unit is known that includes a first lens that suppresses the spread angle of light emitted from a solid-state light source device and a second lens that substantially parallelizes light from the first lens (for example, , See Patent Document 1).

  According to the conventional collimator lens unit, the light whose divergence angle is suppressed by the first lens is approximately collimated by the second lens, so that the light emitted from the solid-state light source device can be approximately collimated efficiently. It becomes.

  On the other hand, a projector using a white solid-state light source device having a solid-state light source that emits main excitation light and a fluorescent layer that converts and emits main excitation light is known (for example, see Patent Document 2). ).

  According to the conventional projector, since the small and light white solid light source device that consumes less energy is provided, a small and light projector that consumes less energy can be configured.

JP 2005-208571 A JP 2005-274957 A

  However, in a conventional projector, the orientation distribution of light emitted from the solid-state light source device shows a Lambertian orientation distribution. Therefore, when a conventional collimator lens unit is applied to a conventional projector, the light is emitted from the collimator lens unit. The light flux density in the vicinity of the optical axis of the collimator lens unit is relatively lower than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit. For this reason, even if an integrator optical system for making the in-plane light intensity distribution of the light emitted from the collimator lens unit uniform is arranged in the subsequent stage, it is irradiated with a large angle of the light irradiated to the illuminated area. The proportion of light that will be increased. As a result, in a projector using a liquid crystal device with a built-in microlens as a light modulation device, the proportion of the light irradiated at a large angle among the light irradiated on the illuminated area increases. As a result, there is a problem that the light utilization efficiency is lowered.

  Therefore, the present invention has been made to solve the above-described problem, and light utilization is caused by the fact that the proportion of light irradiated at a large angle among the light irradiated on the illuminated area becomes large. It is an object of the present invention to provide a collimator lens unit in which efficiency does not decrease. Moreover, it aims at providing an illuminating device provided with such a collimator lens unit. Moreover, it aims at providing a projector provided with such an illuminating device.

[1] A collimator lens unit of the present invention is a collimator lens unit that includes at least two lenses and substantially collimates light emitted from a Lambert light emission type solid-state light source device, and includes at least the two lenses. At least two of the entrance and exit surfaces of each lens constituting the lens are aspheric surfaces, and at least one front aspheric surface located on the side closer to the solid-state light source device of the at least two aspheric surfaces is The light flux density distribution of the light emitted from the solid state light source device is determined so that the light flux density in the vicinity of the optical axis of the collimator lens unit is higher than the light flux density in the peripheral part away from the optical axis of the collimator lens unit. A solid-state light of the at least two aspheric surfaces. The rear aspherical surface of one surface farthest from the apparatus has a function of substantially collimating the light formed in the predetermined light flux density distribution, and the collimator lens unit in the light emitted from the collimator lens unit The light flux density in the vicinity of the optical axis is higher than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit.

  For this reason, according to the collimator lens unit of the present invention, the light flux density in the vicinity of the optical axis of the collimator lens unit in the light emitted from the collimator lens unit is separated from the optical axis of the collimator lens unit. Can be higher than the light flux density in the light source, so that the light utilization efficiency is reduced due to the fact that the proportion of light irradiated to the illuminated area with a large angle increases. Disappears.

  In the present specification, “light flux density” means the light intensity per unit area in the light emitted from the collimator lens unit.

  In the collimator lens unit of the present invention, both the front aspherical surface and the rear aspherical surface are rotationally symmetric aspherical surfaces in which the position of the aspherical surface in the optical axis direction is arbitrarily defined according to the distance from the optical axis. preferable.

[2] In the collimator lens unit of the present invention, the luminous flux density of the light emitted from the collimator lens unit shows a maximum value on the optical axis of the collimator lens unit, and the light of the collimator lens unit. It is preferable that the temperature gradually decreases with distance from the axis.

  With such a configuration, the in-plane light intensity distribution in the illuminated area can be made more uniform.

  [3] The collimator lens unit of the present invention includes, as the at least two lenses, a first lens located on the side closer to the solid light source device and a second lens located on the side far from the solid light source device, Preferably, the first stage aspheric surface is formed on the exit surface of the first lens or the entrance surface of the second lens, and the second stage aspheric surface is formed on the exit surface of the second lens.

  With this configuration, the light flux density in the vicinity of the optical axis of the collimator lens unit out of the light flux density of the light emitted from the solid state light source device is changed to the light flux in the peripheral portion away from the optical axis of the collimator lens unit. It is possible to make it sufficiently higher than the density without difficulty.

[4] In the collimator lens unit of the present invention, it is preferable that the exit surface of the first lens is a spherical surface, and the front aspheric surface is formed on the incident surface of the second lens.

  By configuring in this way, it becomes possible to make light having a larger beam diameter incident on the front aspherical surface compared to the case where the front aspherical surface is formed on the exit surface of the first lens. It is possible to perform the light beam density distribution conversion without difficulty and with high accuracy using the front aspherical surface having a larger area.

[5] In the collimator lens unit of the present invention, it is preferable that a distance between the first lens and the second lens is larger than an effective radius of the first lens.

  By adopting such a configuration, it becomes possible to allow light having a sufficiently large beam diameter to be incident on the preceding aspherical surface.

  Here, the distance between the first lens and the second lens is the distance between the exit surface of the first lens and the entrance surface of the second lens along the optical axis of the collimator lens unit. The effective radius of the first lens is the beam radius of light from the solid state light source device when the light from the solid state light source device passes through the exit surface of the first lens.

[6] In the collimator lens unit of the present invention, it is preferable that the first lens is made of optical glass and the second lens is made of resin.

  In the case where the exit surface of the first lens is a spherical surface and the entrance surface of the second lens is a previous aspheric surface, it is preferable that the first lens is manufactured from optical glass and the second lens is manufactured from resin as described above. In this way, the first lens is manufactured using a normal grinding / polishing method and the second lens is manufactured using a press molding method, thereby manufacturing a collimator lens unit with high mass productivity as a whole. It becomes possible.

[7] In the collimator lens unit of the present invention, it is preferable that nd of the first lens is 1.7 or more.

  By setting it as such a structure, it becomes possible to suppress efficiently the divergence angle of the light inject | emitted from a solid light source device.

  In this specification, “nd” refers to a refractive index with respect to light having a wavelength of 589.3 nm.

[8] In the collimator lens unit of the present invention, it is preferable that the incident surface of the first lens is a flat surface.

  With such a configuration, the first lens can be made inexpensive, and the manufacturing cost of the collimator lens unit can be made inexpensive.

[9] In the collimator lens unit of the present invention, as the at least two lenses, a first lens located on the side closer to the solid-state light source device, a second lens located on the side far from the solid-state light source device, and the first lens A third lens disposed between one lens and the second lens, and two of the exit surface of the first lens, the entrance surface and the exit surface of the third lens, and the entrance surface of the second lens; It is preferable that the front aspheric surface is formed on the second lens, and the rear aspheric surface is formed on the exit surface of the second lens.

  Even with such a configuration, the light flux density in the vicinity of the optical axis of the collimator lens unit out of the light flux density of the light emitted from the solid state light source device is in the peripheral portion away from the optical axis of the collimator lens unit. It is possible to make it sufficiently higher than the light flux density and sufficiently high.

[10] An illuminating device of the present invention is an illuminating device including a Lambert light emission type solid-state light source device and a collimator lens unit that substantially collimates light emitted from the solid-state light source device, and the collimator lens The unit is a collimator lens unit of the present invention.

  For this reason, according to the illuminating device of the present invention, since the collimator lens unit of the present invention is provided, the ratio of the light irradiated with a large angle out of the light irradiated to the illuminated region is increased. As a result, the light use efficiency is not reduced.

[11] In the illumination device of the present invention, the collimator lens unit is the collimator lens unit according to [1] or [2], and the solid light source device is used as the at least two lenses. When the first lens located on the near side and the second lens located on the side far from the solid-state light source device are provided, and the portion that emits light having a Lambertian light distribution in the solid-state light source device is used as the light emitting unit, In the illumination device, a heat radiating member made of a transparent solid or liquid is disposed in contact with the light emitting portion and the first lens, and the front aspheric surface is formed on an emission surface of the first lens. Is preferred.

  By adopting such a configuration, it becomes possible to cool the light emitting portion that is likely to be high temperature via the heat radiating member, and as a result, it is possible to prevent the light emitting portion from being deteriorated and to prolong the life of the lighting device. It becomes possible.

  Also, with this configuration, the heat dissipation member is disposed in contact with the first lens. Therefore, in the optical path from the solid light source device to the first lens, the heat dissipation member and the first lens are related to light refraction. Therefore, the lighting device can be designed relatively easily.

  In addition, with such a configuration, since the front aspherical surface is formed on the exit surface of the first lens, it is possible to make the light flux emitted from the first lens dense.

  Further, by adopting such a configuration, it is possible to increase the distance from the front aspheric surface to the rear aspheric surface as compared with the case where the front aspheric surface is formed on the incident surface of the second lens. For this reason, it is possible to perform light flux density distribution conversion without difficulty and with accuracy using a longer distance.

The “light emitting part” is a part that emits light having a Lambertian light distribution in the solid-state light source device. Examples of the light emitting unit include a fluorescent layer that generates and emits fluorescence from excitation light, and a diffusion plate that converts incident light into light having a Lambertian light distribution and emits it.
In addition, since the light conversion efficiency is greatly reduced due to the high temperature of the fluorescent layer, the above configuration is particularly effective when the fluorescent layer is used as the light emitting portion.

As the heat radiating member, it is preferable to use a member having high thermal conductivity from the viewpoint of cooling the light emitting portion. Moreover, it is preferable to use a thing with high transparency from a viewpoint of light utilization efficiency.
As the heat radiating member, for example, a solid made of sapphire, spinel, quartz glass, optical glass, or the like, or a liquid made of water or other coolant that passes visible light can be used.

[12] In the illumination device according to [11], it is preferable that the front aspheric surface is an elliptical approximate curved surface whose minor axis direction is parallel to the optical axis.

  With this configuration, the light flux density in the vicinity of the optical axis of the collimator lens unit out of the light flux density of the light emitted from the solid state light source device is changed to the light flux in the peripheral portion away from the optical axis of the collimator lens unit. It becomes possible to make it sufficiently higher than the density.

  In the present specification, the “elliptical approximate curved surface” includes both an elliptical surface and a curved surface that approximates an elliptical surface.

[13] In the illumination device according to [11] or [12], when nd of the heat dissipation member is n1 and nd of the first lens is n2, “n2−n1 ≧ 0.2” is satisfied. It is preferable to satisfy the conditions.

  With this configuration, light can be sufficiently refracted at the interface between the heat dissipation member and the first lens.

  From the above viewpoint, it is more preferable to satisfy the condition “n2-n1 ≧ 0.3”. The greater the difference between the nd of the heat dissipating member and the nd of the first lens, the stronger the light can be refracted at the interface between the heat dissipating member and the first lens and the interface between the exit surface of the first lens and the air. Therefore, the first lens is not increased more than necessary.

  For example, sapphire (nd = 1.71) and high-refractive-index optical glass (as a combination of “material of heat radiating member” and “material of first lens” satisfying the condition of “n2-n1 ≧ 0.2”) nd = 2.0 or more, Asahi Glass Co., Ltd. A-NBA20, OHARA Co., Ltd. L-BBH1, etc.), water (nd = 1.333) and high refractive index optical glass (nd = 1.6 or more, OHARA INC.) S-LAL7, etc.), quartz glass or white plate glass (nd = about 1.5) and high refractive index optical glass (nd = 1.75 or more, S-LAH59 of OHARA INC.). Note that the combination of the “material of the heat dissipation member” and the “material of the first lens” in the present invention is not limited to the above combination.

[14] In the illumination device according to any one of [11] to [13], the heat dissipation member is made of a solid, and a surface of the heat dissipation member that is in contact with the incident surface of the first lens is a plane, The incident surface of the first lens is preferably a flat surface.

  With such a configuration, it is possible to reduce the cost of the heat dissipation member and the first lens, and it is possible to reduce the manufacturing cost of the lighting device.

  Further, by adopting such a configuration, it is easy to closely attach the heat dissipation member and the first lens, and it is possible to reduce the manufacturing cost of the lighting device from this viewpoint.

  [15] A projector of the present invention includes an illumination device, a light modulation device that modulates illumination light from the illumination device in accordance with image information, and a projection optical system that projects the modulated light from the light modulation device as a projection image. The illumination device is the illumination device of the present invention.

  For this reason, the projector of the present invention does not reduce the light utilization efficiency due to the fact that the proportion of light irradiated with a large angle out of the light irradiated to the illuminated area is increased. A projector with high light utilization efficiency.

FIG. 2 is a plan view showing an optical system of the projector 1000 according to the first embodiment. 1 is a cross-sectional view of a solid light source device 10 according to Embodiment 1. FIG. The figure shown in order to demonstrate the collimator lens unit 20 which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the collimator lens unit 20a which concerns on Embodiment 2. FIG. The figure shown in order to demonstrate the collimator lens unit 20b which concerns on Embodiment 3. FIG. The figure shown in order to demonstrate the collimator lens unit 20c which concerns on the comparative example 1. FIG. The figure shown in order to demonstrate the collimator lens unit 20d which concerns on the comparative example 2. FIG. The figure shown in order to demonstrate the collimator lens unit 20e which concerns on the comparative example 3. FIG. The figure shown in order to demonstrate the collimator lens unit 20f which concerns on the comparative example 4. FIG. The figure shown in order to demonstrate the illuminating device 100g which concerns on Embodiment 4, and the projector 1000g. The figure shown in order to demonstrate the illuminating device 100h and projector 1000h which concern on Embodiment 5. FIG. The figure shown in order to demonstrate the collimator lens unit 20i which concerns on Embodiment 6. FIG. FIG. 10 is a plan view showing an optical system of a projector 1000j according to a seventh embodiment. The figure which looked at the solid light source array 11a in Embodiment 7 from the collimator lens array 14a side. The figure shown in order to demonstrate the collimator lens unit 20j which concerns on Embodiment 7, and the illuminating device 100j (code | symbol is not shown). The figure shown in order to demonstrate the collimator lens unit 20k and illuminating device 100k (a code | symbol is not shown) which concerns on Embodiment 8. FIG. The figure shown in order to demonstrate the collimator lens unit 20l and illuminating device 100l (a code | symbol is not shown) which concerns on Embodiment 9. FIG.

  Hereinafter, a collimator lens unit, a lighting device, and a projector of the present invention will be described based on the embodiments shown in the drawings.

[Embodiment 1]
First, configurations of the collimator lens unit 20, the illumination device 100, and the projector 1000 according to the first embodiment will be described.

FIG. 1 is a plan view showing an optical system of a projector 1000 according to the first embodiment.
FIG. 2 is a cross-sectional view of the solid-state light source device 10 according to the first embodiment.
FIG. 3 is a view for explaining the collimator lens unit 20 according to the first embodiment. FIG. 3A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is substantially collimated by the collimator lens unit 20, and FIG. 3B is a diagram illustrating light emitted from the collimator lens unit 20. 3 is a graph showing the relative light intensity (relative light flux density) of FIG. 3, and FIG. 3C shows the in-plane light intensity distribution (light flux density distribution) of the light emitted from the collimator lens unit 20.
FIG. Note that the light rays in FIG. 3A are for representing a state in which the light emitted from the solid light source device 10 is substantially collimated by the collimator lens unit 20, and do not reflect the light flux density. The vertical axis in FIG. 3B indicates the relative light intensity of the light emitted from the collimator lens unit 20, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  In the following description, three directions orthogonal to each other are defined as a z-axis direction (illumination optical axis 100ax direction in FIG. 1), an x-axis direction (a direction parallel to the paper surface in FIG. 1 and perpendicular to the z-axis) and y, respectively. An axial direction (direction perpendicular to the paper surface in FIG. 1 and perpendicular to the z-axis) is assumed.

  As shown in FIG. 1, the projector 1000 according to the first embodiment includes an illumination device 100, a color separation light guide optical system 200, three liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B as light modulation devices, and a cross dichroic prism 500. And a projection optical system 600.

  The illuminating device 100 includes a solid-state light source device 10, a collimator lens unit 20, a first lens array 120, a second lens array 130, a polarization conversion element 140, and a superimposing lens 150.

  As shown in FIG. 2, the solid light source device 10 is a Lambert light emitting type light emitting diode having a base 12, a solid light source 14, a fluorescent layer 16, and a sealing member 18, and includes red light, green light, and blue light. Emits white light. The solid-state light source device 10 includes lead wires and the like in addition to the above-described components, but illustration and description thereof are omitted.

  As shown in FIGS. 1 and 3A, the collimator lens unit 20 includes a first lens 22 located on the side closer to the solid light source device 10 and a second lens 24 located on the side far from the solid light source device 10. A collimator lens unit that substantially collimates light emitted from a Lambert light emission type solid state light source device, and the light flux density near the optical axis of the collimator lens unit 20 is collimated. The meter lens unit 20 has a function of converting into light having a higher light flux density than that in the peripheral portion away from the optical axis and emitting the light. Further, the light flux density of the light emitted from the collimator lens unit 20 has a maximum value on the optical axis of the collimator lens unit 20 and gradually decreases as the distance from the optical axis of the collimator lens unit 20 increases. Has been.

  Here, “gradually lower” is used to mean monotonically and continuously lower.

  In addition, the distance d1 between the first lens 22 and the second lens 24 in the collimator lens unit 20 is configured to be larger than the effective radius d2 of the first lens 22.

  The first lens 22 is a plano-convex lens made of optical glass in which the entrance surface 21 is a flat surface and a spherical surface is formed on the exit surface 23, and has a function of suppressing the spread angle of light from the solid-state light source device 10. The nd of the first lens 22 is 1.83.

The second lens 24 is an aspherical biconvex lens made of resin (PMMA (nd = 1.494)) in which a front aspheric surface is formed on the incident surface 25 and a rear aspheric surface is formed on the exit surface 26. (Pre-stage aspherical surface) 25 shows the light flux density distribution of the light emitted from the solid state light source device 10 at the peripheral portion where the light flux density near the optical axis of the collimator lens unit 20 is away from the optical axis of the collimator lens unit 20. It has a light beam density distribution conversion function for converting the light beam density into a predetermined light beam density distribution that is higher than the light beam density, and the exit surface (rear aspheric surface) 26 substantially parallelizes the light formed in the predetermined light beam density distribution. It has a function. As a result, as shown in FIGS. 3B and 3C, the light flux density in the vicinity of the optical axis of the collimator lens unit 20 in the light emitted from the collimator lens unit 20 is the collimator lens unit 20. Is higher than the light flux density in the peripheral part away from the optical axis, and shows a maximum value on the optical axis of the collimator lens unit 20 and gradually decreases as the distance from the optical axis of the collimator lens unit 20 increases.

  The first lens array 120 has a function as a light beam splitting optical element that splits the light from the collimator lens unit 20 into a plurality of partial light beams, and the plurality of first small lenses 122 are orthogonal to the illumination optical axis 100ax. It has a configuration arranged in a matrix of a plurality of rows and a plurality of columns. Although not illustrated, the outer shape of the first small lens 122 is similar to the outer shape of the image forming area of the liquid crystal devices 400R, 400G, and 400B.

  The second lens array 130 has a function of forming an image of each first small lens 122 of the first lens array 120 in the vicinity of the image forming area of the liquid crystal devices 400R, 400G, and 400B together with the superimposing lens 150. The second lens array 130 has substantially the same configuration as the first lens array 120, and a plurality of second small lenses 132 are arranged in a matrix of a plurality of rows and a plurality of columns in a plane orthogonal to the illumination optical axis 100ax. Have a configuration.

The polarization conversion element 140 is a polarization conversion element that emits the polarization direction of each partial light beam divided by the first lens array 120 as approximately one type of linearly polarized light having a uniform polarization direction.
The polarization conversion element 140 includes a polarization separation layer that transmits one linearly polarized light component of the polarized light components included in the illumination light beam from the solid light source device 10 and reflects the other linearly polarized light component in a direction perpendicular to the illumination optical axis 100ax. A reflection layer that reflects the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax, and a position where one linear polarization component transmitted through the polarization separation layer is converted into the other linear polarization component. And a phase difference plate.

  The superimposing lens 150 condenses a plurality of partial light beams that have passed through the first lens array 120, the second lens array 130, and the polarization conversion element 140, and superimposes them on the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B. It is an element. The superimposing lens 150 is arranged so that the optical axis of the superimposing lens 150 and the illumination optical axis 100ax of the illumination device 100 substantially coincide. The superimposing lens 150 may be composed of a compound lens in which a plurality of lenses are combined.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, an incident side lens 260, and a relay lens 270. The color separation light guide optical system 200 separates the illumination light from the illumination device 100 into three color lights of red light, green light, and blue light, and the three liquid crystal devices 400R and 400G that are the illumination targets. , 400B.

  Condensing lenses 300R, 300G, and 300B are disposed in the front stage of the optical path of the liquid crystal devices 400R, 400G, and 400B.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate illumination light according to image information, and are illumination targets of the illumination device 100.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, incident side polarization is performed according to given image information using a polysilicon TFT as a switching element. The polarization direction of one type of linearly polarized light emitted from the plate is modulated.

Although not shown here, incident-side polarizing plates are interposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal devices 400R, 400G, and 400B, and the liquid crystal devices 400R, 400G, and 400B are disposed. Between the 400B and the cross dichroic prism 500, an exit side polarizing plate is interposed. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each color light incident thereon.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the exit side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

  Next, effects of the collimator lens unit 20, the illumination device 100, and the projector 1000 according to the first embodiment will be described.

  According to the collimator lens unit 20 according to the first embodiment, the front aspherical surface formed on the incident surface 25 of the second lens 24 transmits light from the solid-state light source device 10 in the vicinity of the optical axis of the collimator lens unit 20. The collimator lens unit in the light emitted from the collimator lens unit has a function of converting the light beam density into light that is higher than the light flux density in the peripheral part away from the optical axis of the collimator lens unit 20 and emitting the light. The light beam density in the vicinity of the optical axis of the collimator lens unit can be made higher than the light beam density in the peripheral part away from the optical axis of the collimator lens unit. As a result, the light utilization efficiency does not decrease due to the increase in the ratio of the above.

  Further, according to the collimator lens unit 20 according to the first embodiment, the luminous flux density of the light emitted from the collimator lens unit 20 shows the maximum value on the optical axis of the collimator lens unit 20, and the collimator lens unit. Since it is configured so as to gradually decrease as the distance from the 20 optical axis increases, the in-plane light intensity distribution in the illuminated area can be made even more uniform.

  Further, the collimator lens unit 20 according to the first embodiment includes the first lens 22 located on the side closer to the solid light source device 10 and the second lens 24 located on the side far from the solid light source device 10, and the second Since the front aspherical surface is formed on the incident surface 25 of the lens 24 and the rear aspherical surface is formed on the exit surface 26, the light flux density of the light emitted from the solid light source is near the optical axis of the collimator lens unit. The light beam density can be made reasonably and sufficiently higher than the light beam density in the peripheral part away from the optical axis of the collimator lens unit.

  Further, according to the collimator lens unit 20 according to the first embodiment, the exit surface 23 of the first lens 22 is a spherical surface, and the front surface aspheric surface is formed on the incident surface 25 of the second lens 24. Compared to the case where the front aspherical surface is formed on the exit surface of the lens, it is possible to allow light having a larger beam diameter to enter the front aspherical surface, so the front aspherical surface having a wider area is used. Therefore, the light flux density distribution conversion can be performed with ease and accuracy.

  Further, according to the collimator lens unit 20 according to the first embodiment, the distance d1 between the first lens 22 and the second lens 24 in the collimator lens unit 20 is larger than the effective radius d2 of the first lens 22. Therefore, light having a sufficiently large beam diameter can be made incident on the aspheric surface of the previous stage.

  Further, according to the collimator lens unit 20 according to the first embodiment, as described above, the exit surface 23 of the first lens 22 is a spherical surface and the entrance surface 25 of the second lens 24 is an aspheric surface in the previous stage. Can be manufactured from optical glass and the second lens can be manufactured from resin. In this way, the first lens is manufactured using a normal grinding / polishing method and the second lens is manufactured using a press molding method, thereby manufacturing a collimator lens unit with high mass productivity as a whole. It becomes possible.

  Further, according to the collimator lens unit 20 according to the first embodiment, since the nd of the first lens 22 is 1.7 or more, it is possible to efficiently suppress the divergence angle of the light emitted from the solid light source. Become.

  Further, according to the collimator lens unit 20 according to the first embodiment, since the incident surface 21 of the first lens 22 is a flat surface, the first lens can be made inexpensive, and the manufacturing cost of the collimator lens unit is increased. Can be made inexpensive.

  The illumination device 100 according to the first embodiment includes the Lambert light emission type solid-state light source device 10 and the collimator lens unit 20 according to the first embodiment that substantially parallelizes the light emitted from the solid-state light source device 10. In addition, the light use efficiency does not decrease due to an increase in the proportion of light irradiated at a large angle in the light irradiated to the illuminated area.

  According to the projector 1000 according to the first embodiment, since the illumination device 100 according to the first embodiment is provided, the ratio of the light irradiated with a large angle out of the light irradiated on the illuminated area is increased. As a result, the projector can be used with high light utilization efficiency without lowering the light utilization efficiency.

[Embodiment 2]
FIG. 4 is a view for explaining the collimator lens unit 20a according to the second embodiment. FIG. 4A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is approximately parallelized by the collimator lens unit 20a, and FIG. 4B is a light emitted from the collimator lens unit 20a. 4C is a graph showing the in-plane light intensity distribution (light flux density distribution) of the light emitted from the collimator lens unit 20a. Note that the light rays in FIG. 4A are for representing a state in which the light emitted from the solid light source device 10 is substantially collimated by the collimator lens unit 20a, and do not reflect the light flux density. The vertical axis in FIG. 4B indicates the relative light intensity of the light emitted from the collimator lens unit 20a, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 20a according to the second embodiment basically has the same configuration as the collimator lens unit 20 according to the first embodiment, but the configuration of the first lens that constitutes the collimator lens unit 20a is an embodiment. This is different from the case of the collimator lens unit 20 according to FIG. In addition, the configuration of the second lens is different as the configuration of the first lens is different.

  That is, in the collimator lens unit 20a according to the second embodiment, as shown in FIG. 4A, the first lens 22a is a meniscus convex lens. Accordingly, the shapes of the incident surface (front aspheric surface) 25a and the exit surface (rear aspheric surface) 26a of the second lens 24a are different from those of the collimator lens unit 20 according to the first embodiment.

  As described above, the collimator lens unit 20a according to the second embodiment differs from the collimator lens unit 20 according to the first embodiment in the configuration of the first lens 22a and the configuration of the second lens 24a. The front aspherical surface formed on the incident surface 25a of the lens 24a transmits light from the solid-state light source device 10 to the peripheral portion where the light flux density in the vicinity of the optical axis of the collimator lens unit 20a is away from the optical axis of the collimator lens unit 20a. 4 (b) and FIG. 4 (c), the collimator lens unit in the light emitted from the collimator lens unit has the function of emitting light that is higher than the light flux density in FIG. The luminous flux density in the vicinity of the optical axis of the collimator lens unit is higher than the luminous flux density in the periphery away from the optical axis of the collimator lens unit. Therefore, similarly to the collimator lens unit 20 according to the first embodiment, the ratio of the light irradiated at a large angle out of the light irradiated on the illuminated area increases. Usage efficiency will not be reduced.

[Embodiment 3]
FIG. 5 is a view for explaining the collimator lens unit 20b according to the third embodiment. FIG. 5A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is substantially collimated by the collimator lens unit 20b, and FIG. 5B is a light emitted from the collimator lens unit 20b. 5 is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 20b. Note that the light rays in FIG. 5A are for representing a state in which the light emitted from the solid-state light source device 10 is substantially collimated by the collimator lens unit 20b, and do not reflect the light flux density. The vertical axis of FIG. 5B indicates the relative light intensity of the light emitted from the collimator lens unit 20b, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 20b according to the third embodiment basically has the same configuration as the collimator lens unit 20a according to the second embodiment, but the configuration of the first lens that constitutes the collimator lens unit 20b is an embodiment. This is different from the case of the collimator lens unit 20a according to No. 2. In addition, the configuration of the second lens is different as the configuration of the first lens is different.

  That is, in the collimator lens unit 20b according to the third embodiment, as shown in FIG. 5A, the first lens 22b is a meniscus convex lens in which an aspheric surface is formed on the exit surface 23b. Accordingly, the shapes of the entrance surface (front aspheric surface) 25b and the exit surface (back stage aspheric surface) 26b of the second lens 24b are different from those of the collimator lens unit 20a according to the second embodiment.

  As described above, the collimator lens unit 20b according to the third embodiment is different from the collimator lens unit 20a according to the second embodiment in the configuration of the first lens 22b constituting the collimator lens unit 20b. The aspherical surface formed on the exit surface 23b of 22b and the previous aspherical surface formed on the incident surface 25b of the second lens 24b convert the light from the solid-state light source device 10 into the light flux density near the optical axis of the collimator lens unit 20b. Has a function of converting and emitting light that is higher than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit 20b, and as shown in FIGS. 5B and 5C, The light flux density near the optical axis of the collimator lens unit in the light emitted from the meter lens unit Since it can be made higher than the light flux density in the peripheral part away from the optical axis of the ter lens unit, as with the collimator lens unit 20a according to the second embodiment, it has a large angle in the light irradiated on the illuminated area. The light use efficiency is not reduced due to an increase in the ratio of irradiated light.

  Further, according to the collimator lens unit 20b according to the third embodiment, since the aspherical surface is formed on the exit surface 23b of the first lens 22b, the optical path length of the collimator lens unit 20b can be shortened. The collimator lens unit 20b can be downsized.

  Next, a comparative example regarding the collimator lens unit of the present invention will be described.

[Comparative Example 1]
FIG. 6 is a view for explaining the collimator lens unit 20c according to the first comparative example. FIG. 6A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is substantially collimated by the collimator lens unit 20c, and FIG. 6B is a light emitted from the collimator lens unit 20c. 6 is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 20c. The light rays in FIG. 6 (a) are for representing the state in which the light emitted from the solid light source device 10 is substantially collimated by the collimator lens unit 20c, and do not reflect the light flux density. The vertical axis in FIG. 6B indicates the relative light intensity of the light emitted from the collimator lens unit 20c, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 20c according to the comparative example 1 basically has the same configuration as the collimator lens unit 20a according to the second embodiment, but the configuration of the second lens constituting the collimator lens unit 20c is an embodiment. This is different from the case of the collimator lens unit 20a according to No. 2.

  That is, in the collimator lens unit 20c according to the comparative example 1, as shown in FIG. 6A, the second lens 24c has a meniscus convex lens in which the incident surface 25c is a spherical surface and an aspheric surface is formed on the exit surface 26c. Consists of.

  As described above, the collimator lens unit 20c according to the comparative example 1 is provided on any of the exit surface (spherical surface) 23c of the first lens 22c and the incident surface (spherical surface) 25c of the second lens 24c constituting the collimator lens unit 20c. Since the front aspherical surface is not formed, as in the case where the conventional collimator lens unit is applied to the conventional projector, the vicinity of the optical axis of the collimator lens unit 20c in the light emitted from the collimator lens unit 20c is used. Is relatively lower than the light flux density in the peripheral part away from the optical axis of the collimator lens unit 20c (see FIGS. 6B and 6C). For this reason, even if an integrator optical system for making the in-plane light intensity distribution of the light emitted from the collimator lens unit uniform is arranged in the subsequent stage, it is irradiated with a large angle of the light irradiated to the illuminated area. The proportion of light that will be increased. As a result, in a projector using a liquid crystal device with a built-in microlens as a light modulation device, the proportion of the light irradiated at a large angle among the light irradiated on the illuminated area increases. As a result, the light utilization efficiency decreases.

[Comparative Example 2]
FIG. 7 is a view for explaining the collimator lens unit 20d according to the comparative example 2. FIG. 7A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is substantially collimated by the collimator lens unit 20d, and FIG. 7B is a light emitted from the collimator lens unit 20d. FIG. 7C is a graph showing the in-plane light intensity distribution (light flux density distribution) of the light emitted from the collimator lens unit 20d. Note that the light rays in FIG. 7A are for representing a state in which the light emitted from the solid light source device 10 is substantially parallelized by the collimator lens unit 20d, and do not reflect the light flux density. The vertical axis in FIG. 7B indicates the relative light intensity of the light emitted from the collimator lens unit 20d, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 20d according to the comparative example 2 has basically the same configuration as the collimator lens unit 20c according to the comparative example 1, but the configuration of the second lens constituting the collimator lens unit 20d is a comparative example. This is different from the case of the collimator lens unit 20c according to No. 1.

  That is, in the collimator lens unit 20d according to the comparative example 2, as shown in FIG. 7A, the second lens 24d has an aspheric surface on the incident surface 25d and a rear aspheric surface on the exit surface 26d. Aspherical meniscus convex lens.

  However, in the collimator lens unit 20d according to the comparative example 2, the incident surface (aspheric surface) 25d of the second lens 24d constituting the collimator lens unit 20d shows the light flux density distribution of the light emitted from the solid light source device 10. A light beam density distribution conversion function for converting the light beam density in the vicinity of the optical axis of the collimator lens unit 20d into a predetermined light beam density distribution that is higher than the light beam density in the peripheral part away from the optical axis of the collimator lens unit 20d. As in the case where the conventional collimator lens unit is applied to the conventional projector, the light flux density in the vicinity of the optical axis of the collimator lens unit 20d in the light emitted from the collimator lens unit 20d is equal to the collimator. Peripheral part away from optical axis of lens unit 20d Becomes relatively lower than definitive flux density (see FIG. 7 (b) and FIG. 7 (c).). For this reason, even if an integrator optical system for making the in-plane light intensity distribution of the light emitted from the collimator lens unit uniform is arranged in the subsequent stage, it is irradiated with a large angle of the light irradiated to the illuminated area. The proportion of light that will be increased. As a result, in a projector using a liquid crystal device with a built-in microlens as a light modulation device, the proportion of the light irradiated at a large angle among the light irradiated on the illuminated area increases. As a result, the light utilization efficiency decreases.

[Comparative Example 3]
FIG. 8 is a view for explaining the collimator lens unit 20e according to the comparative example 3. FIG. 8A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is substantially collimated by the collimator lens unit 20e, and FIG. 8B is a light emitted from the collimator lens unit 20e. 8 is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 20e. Note that the light rays in FIG. 8A are for representing the state in which the light emitted from the solid light source device 10 is substantially collimated by the collimator lens unit 20e, and do not reflect the light flux density. The vertical axis of FIG. 8B indicates the relative light intensity of the light emitted from the collimator lens unit 20e, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 20e according to the comparative example 3 basically has the same configuration as the collimator lens unit 20d according to the comparative example 2, but the configuration of the second lens constituting the collimator lens unit 20e is a comparative example. This is different from the case of the collimator lens unit 20d according to No. 2.

  That is, in the collimator lens unit 20e according to Comparative Example 3, as shown in FIG. 8A, the second lens 24e has an aspheric surface on the incident surface 25e and a rear aspheric surface on the exit surface 26e. Aspherical biconvex lens.

  However, in the collimator lens unit 20e according to the comparative example 3, the incident surface (aspheric surface) 25e of the second lens 24e constituting the collimator lens unit 20e has a light flux density distribution of the light emitted from the solid light source device 10. A light beam density distribution conversion function for converting the light beam density in the vicinity of the optical axis of the collimator lens unit 20e into a predetermined light beam density distribution so as to be higher than the light beam density in the peripheral part away from the optical axis of the collimator lens unit 20e. However, the light intensity in the vicinity of the optical axis of the collimator lens unit in the light emitted from the collimator lens unit is not sufficient, and the light flux density in the peripheral part away from the optical axis of the collimator lens unit Can not be higher than conventional projectors Similar to the case where the collimator lens unit is applied, the light flux density in the vicinity of the optical axis of the collimator lens unit 20e in the light emitted from the collimator lens unit 20e is away from the optical axis of the collimator lens unit 20e. This is relatively lower than the light flux density at the portion (see FIGS. 8B and 8C). For this reason, even if an integrator optical system for making the in-plane light intensity distribution of the light emitted from the collimator lens unit uniform is arranged in the subsequent stage, it is irradiated with a large angle of the light irradiated to the illuminated area. The proportion of light that will be increased. As a result, in a projector using a liquid crystal device with a built-in microlens as a light modulation device, the proportion of the light irradiated at a large angle among the light irradiated on the illuminated area increases. As a result, the light utilization efficiency decreases.

[Comparative Example 4]
FIG. 9 is a view for explaining the collimator lens unit 20f according to the comparative example 4. FIG. 9A is a diagram showing how light emitted from the solid-state light source device 10 is refracted when passing through the collimator lens unit 20f, and FIG. 9B is emitted from the collimator lens unit 20f. It is a graph which shows the relative light intensity (relative light beam density) of light, FIG.9 (c) is a figure which shows the in-plane light intensity distribution (light beam density distribution) of the light inject | emitted from the collimator lens unit 20f. Note that the light rays in FIG. 9A are for representing the state in which the light emitted from the solid light source device 10 is refracted when passing through the collimator lens unit 20f, and do not reflect the light flux density. The vertical axis in FIG. 9B indicates the relative light intensity of the light emitted from the collimator lens unit 20f, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 20f according to the comparative example 4 basically has the same configuration as the collimator lens unit 20c according to the comparative example 1, but the configuration of the second lens constituting the collimator lens unit 20f is a comparative example. This is different from the case of the collimator lens unit 20c according to No. 1.

  That is, in the collimator lens unit 20f according to Comparative Example 4, as shown in FIG. 9A, the second lens 24f is a meniscus convex lens in which the entrance surface 25f and the exit surface 26f are spherical.

  As described above, the collimator lens unit 20f according to the comparative example 4 has no front aspheric surface formed on either the exit surface 23f of the first lens 22f or the entrance surface 25f of the second lens 24f. A post-stage aspherical surface is not formed on the exit surface 26f of 24f. For this reason, as shown in FIGS. 9B and 9C, the light flux density in the peripheral portion away from the optical axis of the collimator lens unit 20f in the light emitted from the collimator lens unit 20f rises. Yes. Moreover, as shown to Fig.9 (a), the light inject | emitted from the solid light source device 10 cannot be made substantially parallel. As a result, in the light emitted from the collimator lens unit 20f, the light flux density in the vicinity of the optical axis of the collimator lens unit 20f is made higher than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit 20f. The light emitted from the solid-state light source device 10 cannot be made substantially parallel.

  Next, other embodiments of a lighting device and a projector including the collimator lens unit of the present invention will be described.

[Embodiment 4]
FIG. 10 is a diagram for explaining an illumination device 100g and a projector 1000g according to the fourth embodiment.

  The projector 1000g according to the fourth embodiment basically has the same configuration as the projector 1000 according to the first embodiment, but the configuration of the illumination device is different from that of the projector 1000 according to the first embodiment.

  That is, the illumination device 100g according to Embodiment 4 includes a rod integrator optical system 700 as an integrator optical system, as shown in FIG. In addition, description is abbreviate | omitted about what has the structure similar to the illuminating device 100 which concerns on Embodiment 1. FIG.

  The rod integrator optical system 700 includes a condenser lens 710, a polarization conversion rod 720, and a relay lens 730.

  The condenser lens 710 collects the parallel light from the collimator lens unit 20 and guides it to the polarization converter 722 of the polarization conversion rod 720.

  The polarization conversion rod 720 includes a polarization conversion unit 722 and an integrator rod unit 724, and emits light with a uniform in-plane light intensity distribution. The polarization conversion unit 722 has a function of converting light from the condenser lens 710 into substantially one type of linearly polarized light. The integrator rod portion 724 has a function of uniformizing the polarization-converted light by multiple reflection on the inner surface.

  The relay lens 730 has a function of forming an image in the vicinity of the image forming area of the liquid crystal devices 400R, 400G, and 400B without diverging the light emitted from the polarization conversion rod 720 together with the condenser lenses 300R, 300G, and 300B. Note that the relay lens 730 may be composed of a compound lens in which a plurality of lenses are combined.

  Thus, according to the illuminating device 100g which concerns on Embodiment 4, since the Lambert light emission type solid light source device 10 and the collimator lens unit 20 which parallelizes the light inject | emitted from the solid light source device 10 are provided, Similar to the illumination device 100 according to the first embodiment, the light use efficiency is reduced due to an increase in the proportion of light irradiated at a large angle in the light irradiated on the illuminated area. Disappears.

  According to the projector 1000g according to the fourth embodiment, since the illumination device 100g described above is provided, the ratio of the light that is irradiated with a large angle out of the light that is irradiated onto the illuminated region increases. It becomes a projector with high light utilization efficiency, in which utilization efficiency does not decrease.

  The projector 1000g according to the fourth embodiment has the same configuration as that of the projector 1000 according to the first embodiment except for the configuration of the illumination device. Therefore, the corresponding effect among the effects of the projector 1000 according to the first embodiment is directly used. Have.

[Embodiment 5]
FIG. 11 is a diagram for explaining the illumination device 100h and the projector 1000h according to the fifth embodiment. FIG. 11A is a plan view showing an optical system of the projector 1000h, and FIG. 11B is a view showing a color wheel 750.

  As shown in FIG. 11A, the projector 1000h according to the fifth embodiment includes a lighting device 100h, a relay optical system 800, a micromirror light modulator 410, and a projection optical system 610.

  The illumination device 100 h includes a solid light source device 10, a collimator lens unit 20, a rod integrator optical system 740, and a color wheel 750.

  Since the solid-state light source device 10 and the collimator lens unit 20 are the same as those described in the first embodiment, description thereof is omitted.

  The rod integrator optical system 740 includes a condenser lens 742 and an integrator rod 744. The condenser lens 742 collects the parallel light from the collimator lens unit 20 and guides it to the incident surface of the integrator rod 744. The integrator rod 744 makes light incident from the incident surface uniform by multiple reflection on the inner surface, and emits light having a uniform in-plane light intensity distribution.

  As shown in FIG. 11A, the color wheel 750 is disposed immediately before the entrance surface of the integrator rod 744. In the color wheel 750, as shown in FIG. 11B, three transmissive color filters 752R, 752G, 752B and a translucent region 752W are formed in four fan-shaped regions partitioned along the rotation direction. It consists of a disk-shaped member.

  The color filter 752R transmits only the red light component by transmitting the light in the red wavelength region out of the light incident on the integrator rod 744 and reflecting or absorbing the light in the other wavelength regions. Similarly, the color filters 752G and 752B transmit green light in the wavelength region of green or blue out of light incident on the integrator rod 744, and reflect or absorb light in other wavelength regions, respectively. Only the component or the blue light component is transmitted. As the color filters 752R, 752G, and 752B, for example, a dielectric multilayer film, a filter plate formed using a paint, or the like can be preferably used. The light transmissive region 752W allows light incident on the integrator rod 744 to pass through as it is. The light-transmitting region 752W can increase the brightness in the projected image and ensure the brightness of the projected image.

  As shown in FIG. 11A, the relay optical system 800 includes a relay lens 810, a reflection mirror 820, and a condenser lens 830. The relay optical system 800 transmits light from the integrator rod 744 to the micromirror light modulator 410. It has a function of leading to the image forming area.

  The relay lens 810 has a function of forming an image in the vicinity of the image forming region of the micromirror light modulator 410 without diverging the light from the integrator rod 744 together with the condenser lens 830. Note that the relay lens 810 may be composed of a single lens or a complex lens in which a plurality of lenses are combined.

  The reflection mirror 820 is arranged to be inclined with respect to the illumination optical axis 100hax, bends the light from the relay lens 810, and guides it to the micromirror type light modulation device 410. Thereby, a projector can be made compact.

  The condensing lens 830 condenses the light from the relay lens 810 and the reflection mirror 820 onto the image forming area of the micromirror light modulator 410 and projects the light modulated by the micromirror light modulator 410. The enlarged projection is performed together with the system 610.

  The micromirror light modulator 410 has a function of emitting image light representing an image to the projection optical system 610 by reflecting light from the relay optical system 800 with a micromirror corresponding to each pixel according to image information. Is a reflection direction control type light modulation device. As the micromirror type light modulation device 410, for example, DMD (digital micromirror device) (trademark of TI) can be used.

  The image light emitted from the micromirror light modulator 410 is enlarged and projected by the projection optical system 610 to form an image on the screen SCR.

  As described above, according to the illumination device 100h according to the fifth embodiment, the Lambert light emission type solid-state light source device 10 and the collimator lens unit 20 that substantially parallelizes the light emitted from the solid-state light source device 10 are provided. Similar to the illumination device 100 according to the first embodiment, the light use efficiency is reduced due to an increase in the proportion of light irradiated at a large angle in the light irradiated on the illuminated area. Disappears.

  According to the projector 1000h according to the fifth embodiment, since the above-described illumination device 100h is provided, the ratio of the light irradiated with a large angle out of the light irradiated on the illuminated area increases. It becomes a projector with high light utilization efficiency, in which utilization efficiency does not decrease.

[Embodiment 6]
FIG. 12 is a view for explaining the collimator lens unit 20i according to the sixth embodiment. FIG. 12A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is substantially collimated by the collimator lens unit 20i, and FIG. 12B is a light emitted from the collimator lens unit 20i. 12 is a graph showing the relative light intensity (relative light beam density) of FIG. 12, and FIG. 12C is a view showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 20i. Note that the light rays in FIG. 12A are for representing the state in which the light emitted from the solid light source device 10 is substantially collimated by the collimator lens unit 20i, and do not reflect the light flux density. The vertical axis in FIG. 12B indicates the relative light intensity of the light emitted from the collimator lens unit 20 i, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 20i according to the sixth embodiment has basically the same configuration as the collimator lens unit 20 according to the first embodiment. However, the collimator lens according to the first embodiment is further provided with a third lens. This is different from the unit 20.

That is, in the collimator lens unit 20i according to the sixth embodiment, as shown in FIG. 12A, as the at least two lenses, the first lens 22i and the solid light source device 10 located on the side closer to the solid light source device 10 A second lens 24i located on the side far from the first lens 22i and a third lens 28 disposed between the first lens 22i and the second lens 24i, and an exit surface 23i of the first lens 22i and an entrance surface 27 of the third lens 28. The front aspherical surface is formed on the two surfaces, and the rear aspherical surface is formed on the exit surface 26i of the second lens 24i. The entrance surface 21i of the first lens 22i, the entrance surface 25i of the second lens 24i, and the exit surface 29 of the third lens 28 are flat.
In addition, this invention is not limited to said structure, The front | former stage aspherical surface may be formed in the output surface of a 3rd lens, or the entrance surface of a 2nd lens.

  As described above, the collimator lens unit 20i according to the sixth embodiment is different from the collimator lens unit 20 according to the first embodiment in that the third lens 28 is further provided, but the exit surface 23i of the first lens 22i. The front aspheric surface formed on the incident surface 27 of the third lens 28 separates the light from the solid-state light source device 10 so that the light flux density in the vicinity of the optical axis of the collimator lens unit 20i is away from the optical axis of the collimator lens unit 20i. 12 (b) and 12 (c), the collimator in the light emitted from the collimator lens unit has a function to emit light that is higher than the light flux density at the peripheral portion. The light flux density in the vicinity of the optical axis of the meter lens unit is changed to light in the peripheral part away from the optical axis of the collimator lens unit. Since the density can be made higher than the density, the ratio of the light irradiated with a large angle among the light irradiated to the illuminated region is increased, as in the collimator lens unit 20 according to the first embodiment. As a result, the light use efficiency is not reduced.

  Further, according to the collimator lens unit 20i according to the sixth embodiment, the front aspherical surface is formed on the two surfaces of the exit surface 23i of the first lens 22i and the entrance surface 27 of the third lens 28, and the second Since the rear aspherical surface is formed on the exit surface 26i of the lens 24i, even with this configuration, the light flux density of the light emitted from the solid-state light source device is near the optical axis of the collimator lens unit. The light beam density can be made reasonably and sufficiently higher than the light beam density in the peripheral part away from the optical axis of the collimator lens unit.

[Embodiment 7]
FIG. 13 is a plan view showing an optical system of a projector 1000j according to the seventh embodiment.
FIG. 14 is a diagram of the solid-state light source array 11a according to the seventh embodiment as viewed from the collimator lens array 14a side.
FIG. 15 is a diagram for explaining the collimator lens unit 20j and the illumination device 100j (reference numerals are not shown) according to the seventh embodiment. FIG. 15A is a diagram illustrating a state in which light emitted from the solid-state light source device 10a (only the transparent substrate 17a and the fluorescent layer 18a are illustrated) is approximately collimated by the collimator lens unit 20j, and FIG. ) Is a graph showing the relative light intensity (relative luminous flux density) of the light emitted from the collimator lens unit 20j, and FIG. 15 (c) shows the in-plane light intensity distribution (the light intensity emitted from the collimator lens unit 20j). It is a figure which shows light beam density distribution. Note that the light rays in FIG. 15A are for representing the state in which the light emitted from the solid light source device 10a is approximately collimated by the collimator lens unit 20j, and do not reflect the light flux density. The vertical axis in FIG. 15B indicates the relative light intensity of the light emitted from the collimator lens unit 20j, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  Although the illuminating device 100j which concerns on Embodiment 7 has the structure similar to the illuminating device 100 which concerns on Embodiment 1, it is different from the case of the illuminating device 100 which concerns on Embodiment 1 that it is further equipped with a heat radiating member. . In addition, the configuration of the solid-state light source device and the collimator lens unit (the first lens and the second lens) is different with the provision of the heat dissipation member. Hereinafter, the structure of the illuminating device 100j which concerns on Embodiment 7 is demonstrated.

  As shown in FIG. 13, the illumination device 100j according to the seventh embodiment includes a solid-state light source device 10a, a collimator lens unit 20j, a first lens array 120, a second lens array 130, a polarization conversion element 140, And a superimposing lens 150. In the illumination device 100j, the heat dissipation member 30 is disposed in contact with the fluorescent layer 18a (described later) and the first lens 22j (described later).

  The solid light source device 10a is a Lambert light emission type solid light source device including a solid light source array 11a, a collimator lens array 14a, a condensing optical system 16a, a transparent substrate 17a, and a fluorescent layer 18a. White light including green light and blue light is emitted. The solid-state light source device 10a includes lead wires and the like in addition to the above-described components, but illustration and description thereof are omitted.

  As shown in FIG. 14, the solid light source array 11a includes a substrate 12a and 25 solid light sources 13a. In the solid light source array 11a, 25 solid light sources 13a are arranged in a matrix of 5 rows and 5 columns. In FIG. 14, only the upper left solid light source 13a is provided with a reference numeral.

  The solid light source 13a is made of a semiconductor laser that generates blue light as excitation light. The semiconductor laser has a rectangular light emitting region as shown in FIG.

  The collimator lens array 14a is provided corresponding to the 25 solid light sources 13a, and each of the collimator lenses 15a (to one of the end portions) substantially parallelizes the light generated by the 25 solid light sources 13a. Only symbols are shown). Although description by illustration is abbreviate | omitted, the some collimator lens 15a is arrange | positioned at the matrix form of 5 rows 5 columns. The collimator lens 15a is composed of, for example, an aspherical plano-convex lens having a hyperboloidal entrance surface and a flat exit surface.

  The condensing optical system 16a condenses blue light from the collimator lens array 14a (excitation light from the 25 solid light sources 13a) at a predetermined condensing position. The condensing optical system 16a is composed of, for example, an aspheric plano-convex lens having a flat entrance surface and a hyperboloidal exit surface.

  In the present invention, the number and shape of the collimator lenses or the lenses constituting the condensing optical system are not limited to those described above.

The transparent substrate 17a is a member that supports the fluorescent layer 18a, and is made of, for example, quartz glass or optical glass.
The fluorescent layer 18a is located in the vicinity of a predetermined condensing position, and generates and emits fluorescence including red light and green light from part of the blue light from the condensing optical system 16a. The fluorescent layer 18a is a light emitting part in the solid-state light source device 10a.

  The heat dissipation member 30 is made of sapphire (nd = 1.71) which is a transparent solid. A surface in contact with an incident surface 21j (described later) of the first lens 22j (described later) in the heat radiating member 30 is a flat surface.

  The collimator lens unit 20j has basically the same configuration as the collimator lens unit 20 according to the first embodiment, but the configuration of the first lens and the configuration of the second lens are the collimator lens unit according to the first embodiment. This is different from the case of 20. For this reason, in the following description, description is abbreviate | omitted about the part in which the collimator lens unit 20j has the structure similar to the collimator lens unit 20. FIG.

  As shown in FIGS. 13 and 15A, the collimator lens unit 20j includes a first lens 22j located on the side closer to the solid light source device 10a and a second lens 24j located on the side far from the solid light source device 10a. Prepare.

  The first lens 22j is an aspheric plano-convex lens in which the entrance surface 21j is a flat surface and the exit surface 23j is formed with a front aspheric surface having an elliptical approximate curved surface whose short axis direction is parallel to the optical axis. The first lens 22j is made of high refractive index optical glass (nd = 2.07). For this reason, the illumination device 100j satisfies the condition of “n2-n1 ≧ 0.2”, where nd of the heat dissipation member 30 is n1 and nd of the first lens 22j is n2.

  The second lens 24j is an aspherical plano-convex lens made of high refractive index optical glass (nd = 1.70) in which the entrance surface 25j is a flat surface and a rear aspheric surface is formed on the exit surface 26j.

  Since the first lens array 120, the second lens array 130, the polarization conversion element 140, and the superimposing lens 150 are the same as those described in the first embodiment, the description thereof is omitted.

  As described above, the collimator lens unit 20j according to the seventh embodiment differs from the collimator lens unit 20 according to the first embodiment in the configuration of the first lens 22j and the configuration of the second lens 24j. The front aspherical surface formed on the exit surface 23j of the lens 22j allows the light from the solid-state light source device 10a to be separated from the optical axis of the collimator lens unit 20j with a luminous flux density in the vicinity of the optical axis of the collimator lens unit 20j. 15 (b) and FIG. 15 (c), the collimator lens unit in the light emitted from the collimator lens unit has the function of emitting light that is higher than the light flux density in FIG. The luminous flux density in the vicinity of the optical axis is equal to the luminous flux density in the peripheral part away from the optical axis of the collimator lens unit. This is because, similarly to the collimator lens unit 20 according to the first embodiment, the ratio of the light irradiated with a large angle among the light irradiated to the illuminated region becomes high. As a result, the light use efficiency is not reduced.

  The illumination device 100j according to the seventh embodiment is different from the illumination device 100 according to the first embodiment in that the illumination device 100j further includes a heat radiating member 30, but is emitted from the Lambert light emission type solid light source device 10a and the solid light source device 10a. Since the collimator lens unit 20j according to the seventh embodiment that substantially collimates the light to be illuminated is provided, similarly to the illumination device 100 according to the first embodiment, the illuminated area is irradiated with a large angle. The light use efficiency does not decrease due to the increase in the ratio of light.

  Moreover, according to the illuminating device 100j which concerns on Embodiment 7, since the heat radiating member 30 which consists of transparent solid is arrange | positioned in contact with the light emission part (fluorescent layer 18a) and the 1st lens 22j, the light which becomes high temperature easily. The emission part can be cooled via the heat radiating member 30. As a result, the light emission part can be prevented from being deteriorated and the life of the lighting device can be extended.

  Moreover, according to the illuminating device 100j which concerns on Embodiment 7, since the thermal radiation member 30 is arrange | positioned in contact with the 1st lens 22j, in the optical path from the solid light source device 10a to the 1st lens 22j, regarding the refraction of light. Since it is sufficient to consider only the interface between the heat dissipation member 30 and the first lens 22j, the design of the lighting device can be made relatively easy.

  Moreover, according to the illuminating device 100j which concerns on Embodiment 7, since the front | former stage aspherical surface is formed in the output surface 23j of the 1st lens 22j, it is possible to make the light flux inject | emitted from the 1st lens 22j dense. Become.

  Moreover, according to the illuminating device 100j which concerns on Embodiment 7, compared with the case where the front-stage aspherical surface is formed in the entrance surface of a 2nd lens, the distance from a front-stage aspherical surface to a back-stage aspherical surface can be lengthened. Therefore, it is possible to perform the light flux density distribution conversion without difficulty and with high accuracy using a longer distance.

  Moreover, according to the illuminating device 100j which concerns on Embodiment 7, since a front | former stage aspherical surface consists of an elliptical approximate curved surface in which a short-axis direction is parallel to an optical axis, Out of the light flux density of the light inject | emitted from the solid light source device 10a, The light flux density in the vicinity of the optical axis of the collimator lens unit 20j can be made sufficiently higher than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit 20j.

  Further, according to the illumination device 100j according to the seventh embodiment, when the nd of the heat dissipation member 30 is n1, and the nd of the first lens 22j is n2, the condition of “n2-n1 ≧ 0.2” is satisfied. Light can be sufficiently refracted at the interface between the heat dissipation member 30 and the first lens 22j.

  Moreover, according to the illuminating device 100j which concerns on Embodiment 7, the heat radiating member 30 consists of solids, the surface which contact | connects the entrance surface 21j of the 1st lens 22j in the heat radiating member 30 consists of a plane, and the entrance surface 21j of the 1st lens 22j. Since it consists of a flat surface, it is possible to make the heat dissipating member 30 and the first lens 22j inexpensive, and the manufacturing cost of the lighting device can be made inexpensive.

  Moreover, according to the illuminating device 100j which concerns on Embodiment 7, it becomes easy to closely_contact | adhere the heat radiating member 30 and the 1st lens 22j, and the manufacturing cost of an illuminating device can also be made cheap from this viewpoint. Become.

[Embodiment 8]
FIG. 16 is a view for explaining the collimator lens unit 20k and the illumination device 100k (reference numerals are not shown) according to the eighth embodiment. FIG. 16A is a diagram showing a state in which light emitted from the solid-state light source device 10a (only the transparent substrate 17a and the fluorescent layer 18a are shown) is approximately collimated by the collimator lens unit 20k, and FIG. ) Is a graph showing the relative light intensity (relative luminous flux density) of the light emitted from the collimator lens unit 20k, and FIG. 16 (c) shows the in-plane light intensity distribution (the light intensity emitted from the collimator lens unit 20k ( It is a figure which shows light beam density distribution. Note that the light rays in FIG. 16A are for representing a state in which the light emitted from the solid-state light source device 10a is approximately collimated by the collimator lens unit 20k, and do not reflect the light flux density. The vertical axis of FIG. 16B indicates the relative light intensity of the light emitted from the collimator lens unit 20k, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The illumination device 100k (not shown) according to the eighth embodiment has basically the same configuration as the illumination device 100j according to the seventh embodiment, but has a heat dissipation member and a collimator lens unit (first lens and The configuration of the second lens) is different from that of the illumination device 100j according to the seventh embodiment.

  That is, in the illumination device 100k according to the eighth embodiment, the heat radiating member 32 is made of quartz glass (nd = 1.46), and the first lens 22k of the collimator lens unit 20k is a high refractive index optical glass (nd = 2. 07). Accordingly, as shown in FIG. 16A, the shapes of the exit surface (front aspheric surface) 23k of the first lens 22k and the exit surface (back aspheric surface) 26k of the second lens 24k are the same as in the seventh embodiment. It differs from the illuminating device 100j which concerns.

  As described above, the collimator lens unit 20k according to the eighth embodiment differs from the collimator lens unit 20j according to the seventh embodiment in the configuration of the first lens 22k and the configuration of the second lens 24k. The front aspherical surface formed on the exit surface 23k of the lens 22k transmits light from the solid-state light source device 10a to the peripheral portion where the light flux density in the vicinity of the optical axis of the collimator lens unit 20k is away from the optical axis of the collimator lens unit 20k. 16 (b) and FIG. 16 (c), the collimator lens unit in the light emitted from the collimator lens unit has a function to emit light that is higher than the light flux density in FIG. The luminous flux density in the vicinity of the optical axis of the collimator lens unit is separated from the optical axis of the collimator lens unit. This is because, similarly to the collimator lens unit 20j according to the seventh embodiment, the ratio of the light irradiated at a large angle among the light irradiated on the illuminated region is increased. As a result, the light use efficiency is not reduced.

  The illuminating device 100k according to the eighth embodiment differs from the illuminating device 100j according to the seventh embodiment in the configuration of the heat dissipation member 32 and the collimator lens unit 20k (first lens 22k and second lens 24k), but Lambertian light emission. Since the solid-state light source device 10a of the type and the collimator lens unit 20k according to the eighth embodiment that substantially collimates the light emitted from the solid-state light source device 10a are provided, similarly to the illumination device 100j according to the seventh embodiment, The light utilization efficiency does not decrease due to an increase in the proportion of light irradiated at a large angle in the light irradiated to the illumination area.

  In addition, since the illuminating device 100k which concerns on Embodiment 8 has the structure similar to the illuminating device 100j which concerns on Embodiment 7 except the structure of a heat radiating member and a collimator lens unit (1st lens and 2nd lens), it implemented. It has the corresponding effect as it is among the effects of the lighting device 100j according to the seventh aspect.

[Embodiment 9]
FIG. 17 is a view for explaining the collimator lens unit 20l and the illumination device 100l (reference numerals are not shown) according to the ninth embodiment. FIG. 17A is a diagram illustrating a state in which light emitted from the solid-state light source device 10a (only the transparent substrate 17a and the fluorescent layer 18a are illustrated) is approximately collimated by the collimator lens unit 20l, and FIG. ) Is a graph showing the relative light intensity (relative luminous flux density) of the light emitted from the collimator lens unit 20l, and FIG. 17 (c) shows the in-plane light intensity distribution (in the plane of the light emitted from the collimator lens unit 20l). It is a figure which shows light beam density distribution. Note that the light rays in FIG. 17A are for representing a state in which the light emitted from the solid-state light source device 10a is approximately collimated by the collimator lens unit 201, and do not reflect the light flux density. The vertical axis in FIG. 17B indicates the relative light intensity of the light emitted from the collimator lens unit 201, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The illumination device 100l (not shown) according to the ninth embodiment has basically the same configuration as the illumination device 100j according to the seventh embodiment, but has a heat dissipation member and a collimator lens unit (first lens and The configuration of the second lens) is different from that of the illumination device 100j according to the seventh embodiment. Moreover, the point which further has a heat radiating member holding | maintenance part differs from the case of the illuminating device 100j which concerns on Embodiment 7 with the structure of a heat radiating member and a collimator lens unit differing.

  That is, in the illumination device 100l according to the ninth embodiment, the heat dissipation member 34 is made of water (nd = 1.333), and the first lens 22l of the collimator lens unit 20l is a high refractive index optical glass (nd = 1.65). ). Accordingly, as shown in FIG. 17A, the shapes of the exit surface (front aspheric surface) 231 of the first lens 22l and the exit surface (back aspheric surface) 26l of the second lens 24l are the same as in the seventh embodiment. It differs from the illuminating device 100j which concerns.

Moreover, since water is a liquid at normal temperature (5 ° C. to 35 ° C.), the lighting device 100 l further includes a heat dissipation member holding portion 40 for holding the heat dissipation member 34. The heat dissipation member holding part 40 is made of a transparent member (for example, optical glass). The heat dissipation member holding part 40 has a space inside, and the transparent substrate 17a, the fluorescent layer 18a, and the heat dissipation member 34 are accommodated in the space.
Further, the heat radiating member holding portion 40 is provided with a hole for fitting the first lens 20l, and the first lens 22l is attached to the heat radiating member holding portion 40 via a packing 42. For this reason, as shown in FIG. 17A, the first lens 22l is in direct contact with the heat radiating member 34 at the incident surface 951.

  As described above, the collimator lens unit 20l according to the ninth embodiment differs from the collimator lens unit 20j according to the seventh embodiment in the configuration of the first lens 22l and the configuration of the second lens 24l. The front aspherical surface formed on the exit surface 23l of the lens 22l allows light from the solid-state light source device 10a to pass through the peripheral portion where the light flux density in the vicinity of the optical axis of the collimator lens unit 20l is away from the optical axis of the collimator lens unit 20l. As shown in FIGS. 17 (b) and 17 (c), the collimator lens unit in the light emitted from the collimator lens unit has a function of emitting light that is higher than the light flux density in FIG. The luminous flux density in the vicinity of the optical axis of the collimator lens unit is separated from the optical axis of the collimator lens unit. This is because, similarly to the collimator lens unit 20j according to the seventh embodiment, the ratio of the light irradiated at a large angle among the light irradiated on the illuminated region is increased. As a result, the light use efficiency is not reduced.

  The illuminating device 100l according to the ninth embodiment differs from the illuminating device 100j according to the seventh embodiment in the configuration of the heat dissipation member 34 and the collimator lens unit 20l (first lens 22l and second lens 24l), but Lambertian light emission. Since the solid-state light source device 10a of the type and the collimator lens unit 20l according to the ninth embodiment that substantially collimates the light emitted from the solid-state light source device 10a are provided, similarly to the illumination device 100j according to the seventh embodiment, The light utilization efficiency does not decrease due to an increase in the proportion of light irradiated at a large angle in the light irradiated to the illumination area.

  In addition, since the illuminating device 100l which concerns on Embodiment 9 has the structure similar to the illuminating device 100j which concerns on Embodiment 7 except the structure of a heat radiating member and a collimator lens unit (1st lens and 2nd lens), it implemented. It has the corresponding effect as it is among the effects of the lighting device 100j according to the seventh aspect.

  As mentioned above, although this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment. The present invention can be carried out in various modes without departing from the spirit thereof, and for example, the following modifications are possible.

(1) In the first, second, fourth, and fifth embodiments, the front aspheric surface is formed only on the incident surface of the second lens, but the present invention is not limited to this. The front aspheric surface may be formed only on the exit surface of the first lens. In the seventh to ninth embodiments, the rear aspheric surface is formed on the exit surface of the second lens, but the present invention is not limited to this. A post-stage aspheric surface may be formed on the incident surface of the second lens.

(2) In each of the above embodiments, a solid light source device that emits white light is used, but the present invention is not limited to this. You may use the solid light source device which inject | emits light other than white light (For example, the light which consists of monochromatic lights, such as red light, and the light which contains many specific color light components).

(3) Although the collimator lens unit including two lenses is used in the above embodiments 7 to 9, the present invention is not limited to this. A collimator lens unit including three or more lenses may be used. In the sixth embodiment, a collimator lens unit including three lenses is used, but the present invention is not limited to this. A collimator lens unit including four or more lenses may be used.

(4) In the ninth embodiment, the heat radiating member holding portion 40 in which the transparent substrate 17a, the fluorescent layer 18a and the heat radiating member 34 are housed is used, but the present invention is not limited to this. For example, you may use the heat radiating member holding | maintenance part which further accommodates "the apparatus which circulates or stirs a heat radiating member." By doing in this way, it becomes possible to cool a light emission part more strongly by circulating or stirring the heat radiating member which consists of liquids.

(5) In each of the above embodiments, the example in which the illumination device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the lighting device of the present invention can also be applied to other optical devices (for example, optical disk devices, automobile headlamps, various lighting fixtures, etc.).

(6) Although the transmissive projector is used in the first, fourth, and seventh embodiments, the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that a light modulation device as a light modulation means such as a transmission type liquid crystal device transmits light, and “reflection type” means reflection. This means that a light modulation device as a light modulation means such as a liquid crystal device of a type reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(7) In the first, fourth, and seventh embodiments, the projector using the three liquid crystal light modulation devices has been described as an example. However, the present invention is not limited to this. The present invention can also be applied to a projector using one, two, or four or more liquid crystal devices.

(8) The present invention can be applied to a rear projection type projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection type projector that projects from the side that observes the projected image. Is also possible.

DESCRIPTION OF SYMBOLS 10,10a ... Solid light source device, 12 ... Base, 14, 13a ... Solid light source, 16, 18a ... Fluorescent layer, 18 ... Sealing member, 20, 20a, 20b, 20c, 20d, 20e, 20f, 20i, 20j , 20k, 20l ... collimator lens unit, 21, 21a, 21b, 21c, 21d, 21e, 21f, 21i, 21j, 21k, 21l ... incident surface (of the first lens), 22, 22a, 22b, 22c, 22d , 22e, 22f, 22i, 22j, 22k, 22l... First lens, 23, 23a, 23b, 23c, 23d, 23e, 23f, 23i, 23j, 23k, 23l. 24a, 24b, 24c, 24d, 24e, 24f, 24i, 24j, 24k, 24l ... 2nd lens, 25, 25a, 25b, 25c, 25 , 25e, 25f, 25i, 25j, 25k, 25l ... (second lens) entrance surface, 26, 26a, 26b, 26c, 26d, 26e, 26f, 26i, 26j, 26k, 26l ... (second lens) Emission surface, 27... Entrance surface (third lens), 28... Third lens, 29... Exit surface, 30, 32, 34. , 100, 100g, 100h, 100j ... illumination device, 120 ... first lens array, 122 ... first small lens, 130 ... second lens array, 132 ... second small lens, 140 ... polarization conversion element, 150 ... superimposed lens , 200 ... color separation light guide optical system, 210, 220 ... dichroic mirror, 230, 240, 250, 820 ... reflection mirror, 260 ... incident side lens, 270, 730, 81 ... Relay lens, 300R, 300G, 300B, 710, 742, 830 ... Condensing lens, 400R, 400G, 400B ... Liquid crystal device, 410 ... Micromirror light modulator, 500 ... Cross dichroic prism, 600, 610 ... Projection optics 700, 740 ... Rod integrator optical system, 720 ... Polarization conversion rod, 722 ... Polarization conversion unit, 724, 744 ... Integrator rod, 750 ... Color wheel, 752 ... Motor, 800 ... Relay optical system, 11a ... Solid light source array , 12a ... substrate, 14a ... collimator lens array, 15a ... collimator lens, 16a ... condensing optical system, 17a ... transparent substrate, 1000, 1000g, 1000h, 1000j ... projector, SCR ... screen

Claims (15)

A collimator lens unit that includes at least two lenses and substantially collimates light emitted from a Lambert light emission type solid-state light source device,
Of the incident surface and the exit surface of each lens constituting the at least two lenses, at least two surfaces are aspherical surfaces;
Of the at least two aspherical surfaces, at least one front aspherical surface located on the side closer to the solid-state light source device has a light flux density distribution of light emitted from the solid-state light source device as an optical axis of the collimator lens unit. A light beam density distribution conversion function for converting into a predetermined light beam density distribution such that the light beam density in the vicinity is higher than the light beam density in the peripheral part away from the optical axis of the collimator lens unit;
Of the at least two aspherical surfaces, one rear aspherical surface that is farthest from the solid-state light source device has a function of substantially collimating light formed in the predetermined light flux density distribution,
In the light emitted from the collimator lens unit, the light flux density in the vicinity of the optical axis of the collimator lens unit is higher than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit. Collimator lens unit. In the collimator lens unit according to claim 1,
The light flux density of light emitted from the collimator lens unit has a maximum value on the optical axis of the collimator lens unit, and gradually decreases as the distance from the optical axis of the collimator lens unit increases. Collimator lens unit. The collimator lens unit according to claim 1 or 2,
As the at least two lenses, a first lens located on the side closer to the solid state light source device and a second lens located on the side far from the solid state light source device,
The front aspheric surface is formed on the exit surface of the first lens or the entrance surface of the second lens, and the rear aspheric surface is formed on the exit surface of the second lens. Collimator lens unit. The collimator lens unit according to claim 3,
The exit surface of the first lens is a spherical surface,
The collimator lens unit, wherein the front aspherical surface is formed on an incident surface of the second lens. The collimator lens unit according to claim 4,
A collimator lens unit, wherein an interval between the first lens and the second lens is larger than an effective radius of the first lens. The collimator lens unit according to claim 4 or 5,
The collimator lens unit, wherein the first lens is made of optical glass, and the second lens is made of resin. The collimator lens unit according to claim 6,
The collimator lens unit according to claim 1, wherein nd of the first lens is 1.7 or more. In the collimator lens unit according to any one of claims 4 to 7,
The collimator lens unit according to claim 1, wherein an incident surface of the first lens is a flat surface. The collimator lens unit according to claim 1 or 2,
The at least two lenses are arranged between a first lens located on the side closer to the solid light source device, a second lens located on the side far from the solid light source device, and the first lens and the second lens. A third lens,
The front aspherical surface is formed on two of the exit surface of the first lens, the entrance surface and exit surface of the third lens, and the entrance surface of the second lens, and the exit of the second lens A collimator lens unit, wherein the rear aspherical surface is formed on a surface. A Lambert emission type solid state light source device;
A lighting device comprising a collimator lens unit that substantially collimates light emitted from the solid-state light source device,
The said collimator lens unit is a collimator lens unit in any one of Claims 1-9, The illuminating device characterized by the above-mentioned. The lighting device according to claim 10.
The collimator lens unit is the collimator lens unit according to claim 1 or 2, and the first lens located on a side closer to the solid light source device and the solid light source device as the at least two lenses. A second lens located on the far side,
In the solid-state light source device, when a portion that emits light having a Lambertian light distribution is a light emitting unit,
In the illumination device, a heat radiating member made of a transparent solid or liquid is disposed in contact with the light emitting portion and the first lens,
The illumination device characterized in that the front aspheric surface is formed on an exit surface of the first lens. The lighting device according to claim 11.
The front aspherical surface is an illuminating device characterized in that a short axis direction is an elliptical approximate curved surface parallel to the optical axis. The lighting device according to claim 11 or 12,
When nd of the heat dissipation member is n1, and nd of the first lens is n2,
A lighting device characterized by satisfying a condition of “n2-n1 ≧ 0.2”. In the illuminating device in any one of Claims 11-13,
The heat dissipation member is made of a solid,
The surface in contact with the incident surface of the first lens in the heat dissipation member is a flat surface,
The illumination device according to claim 1, wherein an incident surface of the first lens is a flat surface. A lighting device;
A light modulation device that modulates illumination light from the illumination device according to image information;
A projector including a projection optical system that projects the modulated light from the light modulation device as a projection image,
The projector according to claim 10, wherein the lighting device is the lighting device according to claim 10.