Abstract:
The invention relates to a viewing and an image pickup optical system for display devices, which can be used with high efficiency at a plurality of wavelengths and enables bright images to be viewed with satisfactory color reproducibility and well-corrected aberrations. The optical system comprises a first prism 3, a second prism 4 and a volume hologram element 6 disposed between them and cemented to them. The hologram element 6 comprises a first volume hologram optimized in such a way as to effect diffraction at least at a first wavelength and a second hologram optimized in such a way as to effect diffraction at a second wavelength different from the first wavelength. The first and second holograms forming the hologram element 6 are identical with each other in terms of the shape and spacing of interference fringes on their surfaces but different from each other in terms of the spacing and tilt of interference fringes in their hologram media.
Abstract:
The invention provides an optical apparatus enabling diopter adjustment, etc. to be achieved using, for instance, a reflection type variable-optical property optical element or a variable-optical property mirror but without recourse to any mechanical moving part. The variable-optical property mirror 9 comprises an aluminum-coated thin film 9a and a plurality of electrodes 9b. Via variable resistors 11 and a power source switch 13 a power source 12 is connected between the thin film 9a and the electrodes 9b, so that the resistance values of the variable resistors 11 can be controlled by an operating unit 14. The shape of the thin film 9a as a reflecting surface is controlled by changing the resistance value of each variable resistor 11 in response to a signal from the operating unit 14 in such a manner that the imaging capability of the variable mirror is optimized.
Abstract:
The invention relates to an optical connector module that can accommodate well to a wide wavelength-band range and provide a high-precision connection by adjustment of only one lens. Operating to enter optical signals emerging from a plurality of input optical waveguides 10 and having a wavelength in the range of 1.2 nullm to 1.7 nullm in a plurality of output optical waveguides 20, the optical connector module uses one bilateral telecentric optical system 1 to provide optical connections of at least two light beams from the input optical waveguides 10 to the output optical waveguides 20.
Abstract:
The present invention is a translucent screen comprising a plurality of spherical lenses arranged in an orthohexagonal lattice structure or a tetragonal lattice structure on a two-dimensional plane, a supporting member disposed at the incident side of the spherical lenses, a diffusion plate which is disposed at the emission side of the spherical lenses where the surface at the side facing the spherical lenses is the diffusion surface, and a shield which connects the spherical lenses, defines the entrance aperture at the incident side and functions as a black matrix at the emission side, wherein the luminous flux entering diagonally is converted to the luminous flux which center is a direction approximately vertical to the main surface of the translucent screen, and are emitted.
Abstract:
The invention provides an optical element that has a low refractive-index chromatic dispersion, a high degree of freedom in molding or forming as is the case with synthetic resins, and moldability or formability that lends itself to mass production. The optical element is obtained by molding or otherwise forming a composition containing a first material that is a fine particle having an Abbe number vd of 80 or greater indicative of a chromatic dispersion in a visible range and having a size of less than 400 nm, and a second material that is an organic/inorganic hybrid material comprising an organic polymer material having a carbon-carbon bond in a main chain and an inorganic component.
Abstract:
An observation optical system comprises an image display element 5 and an eyepiece optical system which introduces an image formed by the image display element 5 to a center of an eye of an observer without forming an intermediate image, so as to allow the observer to observe the image as a virtual image. The eyepiece optical system is constructed and arranged to bend the optical axis using reflecting surfaces so as to be compact. The optical axis lies in a plane, with respect to which the optical system is formed symmetric. The optical system includes a prism 3 having an entrance surface 33, a plurality of curved reflecting surfaces 31, 32 and an exit surface 31. The reflecting surface 32 is provided with a volume hologram (HOE) 4. Whereby, it is possible to provide an image observation optical system which can be made compact enough to be usable as an image display unit for a cellular phone or a portable intelligent terminal, and which can achieve high image definition and wide field angle while controlling chromatic aberration of magnification to be small.
Abstract:
The invention relates to a viewing and an image pickup optical system for display devices, which can be used with high efficiency at a plurality of wavelengths and enables bright images to be viewed with satisfactory color reproducibility. The optical system comprises a first prism 3, a second prism 4 and a volume hologram element 6 disposed between them and cemented to them. The hologram element 6 comprises a first grating vector corresponding to at least a first wavelength and a second grating vector corresponding to a second wavelength shorter than the first wavelength. As the light beam comprising the first and second wavelengths passes through the hologram element 6, the component of the first wavelength transmits at a given angle of incidence in a region between a first nullnull continuous curved region in which the diffraction efficiency is 10% or greater as determined form the first grating vector and a second nullnull continuous curved region in which the diffraction efficiency is 10% or greater as determined from the second grating vector, and the component of the second wavelength transmits at a given angle of incidence in a region on a shorter wavelength side with respect to the 2 nullnull continuous curved region.