JP2011133606A - Collimator lens unit, lighting system, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collimator lens unit that prevents a reduction in light utilization efficiency when the ratio of the light emitted to a target region at a large angle is increased. <P>SOLUTION: The collimator lens unit 20 includes a first lens 22 and second lens 24, and substantially parallelizes the light emitted from a Lambertian solid-state light source unit 10. A pre-stage aspherical surface formed on an incidence plane 25 of the second lens 24 has a luminous flux density distribution converting function that changes a luminous flux density distribution of the light emitted from the solid-state light source unit to a predetermined luminous flux density distribution. A post-stage aspherical surface formed on an exit plane 26 of the second lens 24 has a function of substantially parallelizing the light from the pre-stage aspherical surface. The luminous flux density near the optical axis of the collimator lens unit 20 of the light emitted from the collimator lens unit 20 is higher than the luminous flux density in a periphery distant from the optical axis of the collimator lens unit 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

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.

[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 production 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, the light use efficiency is reduced due to an increase in the proportion of light irradiated at a large angle in the light irradiated to the illuminated area. Disappears.

  [11] A projector of the present invention includes an illumination device, a light modulation device that modulates illumination light from the illumination device according to 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 30 which concerns on Embodiment 2. FIG. The figure shown in order to demonstrate the collimator lens unit 40 concerning Embodiment 3. FIG. The figure shown in order to demonstrate the collimator lens unit 50 which concerns on the comparative example 1. FIG. The figure shown in order to demonstrate the collimator lens unit 60 which concerns on the comparative example 2. FIG. The figure shown in order to demonstrate the collimator lens unit 70 which concerns on the comparative example 3. FIG. The figure shown in order to demonstrate the collimator lens unit 80 which concerns on the comparative example 4. FIG. FIG. 10 is a diagram for explaining an illumination device 106 and a projector 1006 according to a fourth embodiment. FIG. 10 is a view for explaining an illumination device and a projector 1008 according to a fifth embodiment.

  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. 3C is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 20. 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 a 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 in the vicinity of 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, it is possible to make the first lens inexpensive, and the manufacturing cost of the collimator lens unit. 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 30 according to the second embodiment. 4A 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 30, and FIG. 4B is a diagram illustrating light emitted from the collimator lens unit 30. 4C is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 30. FIG. The light rays in FIG. 4A 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 30, 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 30, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 30 according to the second embodiment has basically 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 30 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 30 according to the second embodiment, the first lens 32 is a meniscus convex lens as shown in FIG. Accordingly, the shapes of the incident surface (front aspheric surface) 35 and the exit surface (rear aspheric surface) 36 of the second lens 34 are different from those of the collimator lens unit 20 according to the first embodiment.

  Thus, according to the collimator lens unit 30 according to the second embodiment, the configuration of the first lens 32 and the configuration of the second lens 34 are different from the case of the collimator lens unit 20 according to the first embodiment. The pre-stage aspheric surface formed on the incident surface 35 of the second lens 34 allows the light from the solid-state light source device 10 to be separated from the optical axis of the collimator lens unit 30 by the light flux density in the vicinity of the optical axis of the collimator lens unit 30. As shown in FIGS. 4B and 4C, the collimator in the light emitted from the collimator lens unit has a function of emitting light that is higher than the light flux density in the peripheral portion. The light flux density near the optical axis of the lens unit should be higher than the light flux density at 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 light use efficiency is increased due to the fact that the ratio of the light irradiated with a large angle out of the light irradiated on the illuminated area becomes high. Will not drop.

[Embodiment 3]
FIG. 5 is a view for explaining the collimator lens unit 40 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 40, and FIG. 5B is a light emitted from the collimator lens unit 40. 5 is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 40. FIG. Note that the light rays in FIG. 5A 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 40, and do not reflect the light flux density. The vertical axis in FIG. 5B indicates the relative light intensity of the light emitted from the collimator lens unit 40, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 40 according to the third embodiment basically has the same configuration as the collimator lens unit 30 according to the second embodiment, but the configuration of the first lens that constitutes the collimator lens unit 40 is an embodiment. This is different from the case of the collimator lens unit 30 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 40 according to the third embodiment, the first lens 42 is a meniscus convex lens in which an aspheric surface is formed on the exit surface 43, as shown in FIG. Accordingly, the shapes of the incident surface (front aspheric surface) 45 and the exit surface (rear aspheric surface) 46 of the second lens 44 are different from those of the collimator lens unit 30 according to the second embodiment.

  Thus, according to the collimator lens unit 40 according to the third embodiment, the configuration of the first lens 42 constituting the collimator lens unit 40 is different from that of the collimator lens unit 30 according to the second embodiment. The aspherical surface formed on the exit surface 43 of the first lens 42 and the previous aspherical surface formed on the incident surface 45 of the second lens 44 allow the light from the solid-state light source device 10 to be transmitted in the vicinity of the optical axis of the collimator lens unit 40. As shown in FIGS. 5B and 5C, the light beam density has a function of converting and emitting light having a higher light beam density than the light beam density in the peripheral portion away from the optical axis of the collimator lens unit 40. The light flux density near the optical axis of the collimator lens unit in the light emitted from the collimator lens unit is Since it can be made higher than the light flux density in the peripheral part away from the optical axis of the base, similarly to the collimator lens unit 30 according to the second embodiment, the light is irradiated with a large angle in the light irradiated on the illuminated area. As a result, the light utilization efficiency does not decrease due to an increase in the ratio of the emitted light.

  Further, according to the collimator lens unit 40 according to the third embodiment, since the aspherical surface is formed on the exit surface 43 of the first lens 42, the optical path length of the collimator lens unit 40 can be shortened. The collimator lens unit 40 can be reduced in size.

  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 50 according to Comparative Example 1. FIG. 6A is a diagram illustrating a state in which light emitted from the solid-state light source device 10 is approximately collimated by the collimator lens unit 50, and FIG. 6B is a diagram illustrating light emitted from the collimator lens unit 50. 6 is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 50. FIG. The light rays in FIG. 6A 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 60, 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 50, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 50 according to the comparative example 1 basically has the same configuration as the collimator lens unit 30 according to the second embodiment, but the configuration of the second lens constituting the collimator lens unit 50 is an embodiment. This is different from the case of the collimator lens unit 30 according to FIG.

  That is, in the collimator lens unit 50 according to the comparative example 1, as shown in FIG. 6A, the second lens 54 is a meniscus convex lens in which the entrance surface 55 is a spherical surface and the exit surface 56 is formed with an aspheric surface. Consists of.

  As described above, according to the collimator lens unit 50 according to the comparative example 1, the exit surface (spherical surface) 53 of the first lens 52 and the incident surface (spherical surface) 55 of the second lens 54 constituting the collimator lens unit 50 are obtained. Since no previous aspheric surface is formed in any of the above, the light of the collimator lens unit 50 in the light emitted from the collimator lens unit 50 is the same as when the conventional collimator lens unit is applied to the conventional projector. The light beam density in the vicinity of the axis is relatively lower than the light beam density in the peripheral part away from the optical axis of the collimator lens unit 50 (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 diagram for explaining the collimator lens unit 60 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 60, and FIG. 7B is a diagram illustrating light emitted from the collimator lens unit 60. 7C is a graph showing the in-plane light intensity distribution (light beam density distribution) of the light emitted from the collimator lens unit 60. FIG. Note that the light rays in FIG. 7A 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 60 and do not reflect the light flux density. The vertical axis of FIG. 7B indicates the relative light intensity of the light emitted from the collimator lens unit 60, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 60 according to the comparative example 2 has basically the same configuration as the collimator lens unit 50 according to the comparative example 1, but the configuration of the second lens constituting the collimator lens unit 60 is the comparative example. This is different from the case of the collimator lens unit 50 according to FIG.

  That is, in the collimator lens unit 60 according to the comparative example 2, as shown in FIG. 7A, the second lens 64 has an aspheric surface on the incident surface 65 and a rear aspheric surface on the exit surface 66. Aspherical meniscus convex lens.

  However, according to the collimator lens unit 60 according to the comparative example 2, the incident surface (aspheric surface) 65 of the second lens 64 constituting the collimator lens unit 60 has a light flux density distribution of light emitted from the solid light source device 10. Is a light flux density conversion function for converting the light flux density in the vicinity of the optical axis of the collimator lens unit 60 into a predetermined light flux density distribution that is higher than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit 60. Therefore, 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 60 in the light emitted from the collimator lens unit 60 is collimated. Light flux density at the periphery of the meter lens unit 60 away from the optical axis Becomes relatively lower than (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 70 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 70, and FIG. 8B is a diagram illustrating light emitted from the collimator lens unit 70. 8 is a graph showing the in-plane light intensity distribution (light beam density distribution) of light emitted from the collimator lens unit 70. FIG. Note that the light rays in FIG. 8A are for representing the state in which the light emitted from the solid-state light source device 10 is approximately parallelized by the collimator lens unit 70, and do not reflect the light flux density. The vertical axis in FIG. 8B indicates the relative light intensity of the light emitted from the collimator lens unit 70, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 70 according to the comparative example 3 basically has the same configuration as the collimator lens unit 60 according to the comparative example 2, but the configuration of the second lens constituting the collimator lens unit 70 is the comparative example. This is different from the case of the collimator lens unit 60 according to No. 2.

  That is, in the collimator lens unit 70 according to the comparative example 3, as shown in FIG. 8A, the second lens 74 has an aspheric surface formed on the incident surface 75 and a rear aspheric surface formed on the exit surface 76. Aspherical biconvex lens.

  However, according to the collimator lens unit 70 according to the comparative example 3, the incident surface (aspheric surface) 75 of the second lens 74 constituting the collimator lens unit 70 has a light flux density of light emitted from the solid light source device 10. Light flux density distribution conversion for converting the distribution into a predetermined light flux density distribution in which the light flux density in the vicinity of the optical axis of the collimator lens unit 70 is higher than the light flux density in the peripheral part away from the optical axis of the collimator lens unit 70 Although it has a function but its capability is insufficient, 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 in the peripheral part away from the optical axis of the collimator lens unit Since it cannot be higher than the luminous flux density, As in the case where the encoder lens unit is applied, the light flux density in the vicinity of the optical axis of the collimator lens unit 70 in the light emitted from the collimator lens unit 70 is away from the optical axis of the collimator lens unit 70. 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 diagram for explaining a collimator lens unit 80 according to 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 80, and FIG. 9B is emitted from the collimator lens unit 80. FIG. 9C is a graph showing the in-plane light intensity distribution (light beam density distribution) of light emitted from the collimator lens unit 80. FIG. Note that the light rays in FIG. 9A are for representing a state in which the light emitted from the solid light source device 10 is refracted when passing through the collimator lens unit 80, and does 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 80, and the light intensity on the optical axis is 1. The horizontal axis indicates the distance from the optical axis.

  The collimator lens unit 80 according to the comparative example 4 basically has the same configuration as the collimator lens unit 50 according to the comparative example 1, but the configuration of the second lens constituting the collimator lens unit 80 is a comparative example. This is different from the case of the collimator lens unit 50 according to FIG.

  That is, in the collimator lens unit 80 according to the comparative example 4, as shown in FIG. 9A, the second lens 84 is a meniscus convex lens in which the entrance surface 85 and the exit surface 86 are spherical surfaces.

  As described above, according to the collimator lens unit 80 according to the comparative example 4, neither the exit surface 83 of the first lens 82 nor the entrance surface 85 of the second lens 84 is formed with the previous aspherical surface. The rear aspherical surface is not formed on the exit surface 86 of the lens 84. For this reason, as shown in FIG. 9B and FIG. 9C, the light flux density in the peripheral part away from the optical axis of the collimator lens unit 80 in the light emitted from the collimator lens unit 80 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 80, the light flux density in the vicinity of the optical axis of the collimator lens unit 80 is made higher than the light flux density in the peripheral portion away from the optical axis of the collimator lens unit 80. 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 the illumination device 106 and the projector 1006 according to the fourth embodiment.

  The projector 1006 according to the fourth embodiment basically has the same configuration as that of 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 illuminating device 106 according to Embodiment 4 includes a rod integrator optical system 700 as an integrator optical system, as shown in FIG. Note that description of the projector having the same configuration as that of the projector 100 according to the first embodiment is omitted.

  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.

  As described above, the illumination device 106 according to the fourth embodiment includes 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. 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 1006 according to the fourth embodiment, since the above-described illumination device 106 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.

  The projector 1006 according to the fourth embodiment has the same configuration as the projector 1000 according to the first embodiment except that the configuration of the illumination device 106 is different from the projector 1000 according to the first embodiment. It has the corresponding effect as it is among the effects of 1000.

[Embodiment 5]
FIG. 11 is a diagram for explaining the illumination device 108 and the projector 1008 according to the fifth embodiment. FIG. 11A is a plan view showing an optical system of the projector 1008, and FIG. 11B is a view showing a color wheel 750.

  As shown in FIG. 11A, the projector 1008 according to the fifth embodiment includes a lighting device 108, a relay optical system 800, a micromirror type light modulation device 410, and a projection optical system 610.

  The illumination device 108 includes the solid-state light source device 10, the 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 with 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 108ax, 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, the illumination device 108 according to the fifth embodiment includes the Lambert light emission type solid-state light source device 10 and the collimator lens unit 20 that substantially collimates the light emitted from the solid-state light source device 10. 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 1008 according to the fifth embodiment, since the above-described illumination device 108 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.

  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 each of the above embodiments, the previous aspheric surface is formed on the incident surface of the second lens, but the present invention is not limited to this. For example, the front aspherical surface may be formed on the exit surface of the first lens.

(2) Although the collimator lens unit including the first lens and the second lens is used in each of the above embodiments, the present invention is not limited to this. A collimator lens unit including a first lens, a second lens, and a third lens disposed between the first lens and the second lens may be used. At this time, a 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 surface of the second lens. It is preferable that a rear aspherical surface is formed.
Also in this way, the luminous flux density in the vicinity of the optical axis of the collimator lens unit out of the luminous flux density of the light emitted from the solid state light source is more than the luminous flux density in the peripheral part away from the optical axis of the collimator lens unit. However, it can be made sufficiently high.

(3) 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.).

(4) Although the transmissive projector is used in the first and fourth 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.

(5) In the first and fourth embodiments, the projector using 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.

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

DESCRIPTION OF SYMBOLS 10 ... Solid light source device, 12 ... Base, 14 ... Solid light source, 16 ... Fluorescent layer, 18 ... Sealing member, 20, 30, 40, 50, 60, 70, 80 ... Collimator lens unit 21, 31, 41, 51, 61, 71, 81 (incident surface of first lens), 22, 32, 42, 52, 62, 72, 82 ... first lens, 23, 33, 43, 53, 63, 73, 83 ... Exit surface (of the first lens), 24, 34, 44, 54, 64, 74, 84 ... Second lens, 25, 35, 45, 55, 65, 75, 85 ... Incident surface (of the second lens) , 26, 36, 46, 56, 66, 76, 86 ... (second lens) exit surface, 100, 106, 108 ... illumination device, 120 ... first lens array, 122 ... first small lens, 130 ... first. 2-lens array, 132 ... second small lens, 140 ... polarization conversion 150, superimposing lens, 200 ... color separation light guide optical system, 210, 220 ... dichroic mirror, 230, 240, 250, 820 ... reflection mirror, 260 ... incident side lens, 270, 730, 810 ... 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 optical system, 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, 1000, 1006, 1008 ... Projector, SCR ... screen

Claims (11)

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-state light source device, a second lens located on the side far from the solid-state light source device, and the first lens and the second lens. A third lens,
The front aspheric 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 1-7, The illuminating device characterized by the above-mentioned. 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.