Light source optical system, light source unit, light source device, and image display device
A technology of optical system and light source device, which is applied in the direction of optical components, optics, projection devices, etc., can solve the problem of uneven illumination of the screen, achieve the effect of improving illumination distribution and simple composition
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no. 1 approach 》
[0040] figure 2 It is a schematic diagram of the configuration of the light source device 12 of the first embodiment. The light source device 12 has a laser light source (light source) 20, a collimator lens 21, a first lens group 22, a light guide member 23, a 1 / 4 wavelength plate 24, a second lens group 25, a phosphor wheel (wavelength conversion element) 26 , third lens group 27 , and color wheel 28 . For example, the light source optical system in the light source device 12 is constituted by components (optical components) other than the laser light source 20 .
[0041] The laser light source 20 has a plurality of light sources (solid-state light sources). figure 2 6 light sources arranged in the longitudinal direction of the figure are depicted in the figure, but in fact, the 6 light sources form n columns (n is a number greater than 2) in the direction (depth direction) perpendicular to the drawing surface, and 6×n light sources are Two-dimensional array arrangemen...
no. 2 approach 》
[0103] Figure 7 It is a schematic diagram of the configuration of the light source device 12 according to the second embodiment. The light source device 12 of the second embodiment has a light guide member 30 instead of the light guide member 23 of the first embodiment.
[0104]In the direction in which the first light beam travels from the laser light source 20 to the light guide member 30 (the M1 direction), the light guide member 30 is arranged eccentrically with respect to the optical axis LX. The light guide member 30 is not a polarizing beam splitter like the light guide member 23 , but a dichroic mirror that reflects light in the wavelength band of the excitation light BL and transmits light in the wavelength band of the fluorescent light YL. A 1 / 4 wavelength plate is not provided between the light guide member 30 and the second lens group 25 . The above are the differences between the second embodiment and the first embodiment. The configuration other than that is ...
no. 3 approach 》
[0129] Figure 11 The illustrated third embodiment of the light source device 12 only shows the arrangement of the light guide member 31 viewed from the front (and viewed from the rear) along the optical axis LX. The configuration other than the light guide member 31 is the same as that of the second embodiment, and the illustration and description of the same parts will be omitted below.
[0130] The light guide member 31 is a parallel plate shape formed of glass or transparent resin, and has a front surface 31a, a back surface 31b, a long side end surface (first end surface) 31c, a long side end surface (second end surface) 31d, a short side end surface 31e, a short side end surface 31e, and a short side end surface 31e. The side end surfaces 31f are surfaces corresponding to the respective surfaces 30a to 30f of the light guide member 30 of the second embodiment.
[0131] The light guide member 31 has an asymmetrical shape with respect to both the virtual plane S1 includin...
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