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Lighting system and projection type display unit using thereof
| Details |
Inventors: Okamori, Shinji; Shikama, Shinsuke;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Adams; Russell
Assistant Examiner: Nguyen; Michelle
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch, LLP
A lighting system comprising converging means (1, 2) for converging a light emitted from an illuminant to form a converged image, a light mixing element 3 for having an end face of incidence 31 near the position at which the converged image is formed, and reducing an irregular luminance of the converged image of the illuminant to form a uniform light source face on an end face of emergence 32, and an optical system for transmission for directing an illuminating light flux from the plane of light emergence onto the illuminated face 5 side in a non-telecentric state, a first lens group 45 and a second lens group 46 being arranged in order from the light mixing element 3 side to the illuminated face 5 side of a light bulb, in which a first optical conjugate relation exists between the end face of incidence 31 of the light mixing element 3 and a virtual face at a position of a aperture stop 6 disposed in the vicinity of a lens means final face closest to the illuminated face constituting the second lens group in terms of the first lens group and the second lens group, and a second optical conjugate relation exists between the end face of emergence of the light mixing element 3 and the illuminated face 5. |
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DETAILED DESCRIPTION The present invention has been achieved to solve the above-mentioned problems, and it is an object of the invention to provide an optical system for illumination (lighting system), and a projector device (projection type display unit) using the optical system for illumination (lighting system), by directing an illuminating light flux to a reflective type light bulb represented by a DMD, without the use of expensive optical elements such as a critical angle prism, wherein there is no significant effect on the illumination performance, particularly the illumination uniformity, even if the illuminating light flux is partly intercepted.
According to the present invention, there is provided a lighting system comprising converging means for converging a light emitted from an illuminant and forming a converged image of the illuminant at a predetermined position, a light mixing element for having an end face of incidence near the position at which the converged image of the illuminant is formed, and reducing an irregular luminance of the converged image of the illuminant incident on the end face of incidence to form a uniform light source face on an end face of emergence, and an optical system for transmission for directing an illuminating light flux from the plane of light emergence onto the illuminated face side of a light bulb in a non-telecentric state, a first lens group and a second lens group being arranged in order from the light mixing element side to the illuminated face side of the light bulb, in which a first optical conjugate relation exists between the end face of incidence of the light mixing element and a virtual face at a position of a diaphragm disposed in the vicinity of a lens means final face closest to the illuminated face constituting the second lens group in terms of the first lens group and the second lens group, and a second optical conjugate relation exists between the end face of emergence of the light mixing element and the illuminated face.
In the lighting system according to the invention, the second lens group of the optical system for transmission is comprised of a meniscus lens having a negative refracting power with a convex face directed toward the light mixing element, and a lens having a positive refracting power, which are arranged in order from the light mixing element side
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Lighting 
