A color display apparatus includes a light source for emitting white light, a spectral unit for dispersing the white light into a red (R) light ray, a green (G) light ray, and a blue (B) light ray, and a spatial light modulation device. The spatial light modulation device includes a single hologram lens layer for diffracting and emitting incident light rays in predetermined directions depending on incident angles and wavelength bands and a liquid-crystal panel having a liquid-crystal layer for p...

An Illumination apparatus according to the present invention is provided with a light source, a mirror that reflects a light emitted by the light source and converts it to a convergent light beam, and a collimator lens that collimates the convergent light beam reflected by the mirror to a collimated light beam. Here, the collimator lens is provided with a region positioned at a central region with respect to an optical axis and having a negative focal distance, and a plurality of concentric annu...

A point where a first diffraction grating and an incident optical axis intersect is named as first intersection point, lengths from the first intersection point to points where .+-.primary-order diffracted lights by the first diffraction grating intersect a light receiving plane are named as first-a(1a) optical path length, first-b(1b) optical path length, and an average thereof is named as first average optical path length. A point where a second diffraction grating and the incident optical axi...

Charges are read out from a CCD n (where n is an integer or greater) times within 1 field period, under the control of a controller. Under the control of a memory controller, a VTR records the n images as a video signal for 1 field, based on the readout charges. When playing back, under control of the memory controller, the video signal for 1 field, which is read out from the VTR and which includes n images, is temporarily stored in a memory. The memory controller reads out the n images from the...

A projection display apparatus (100) is formed by a light source (4) radiating white light w, a collimator lens (5) that converts condensed light flux from the light source (4) to collimated light flux, a cold mirror (6) for eliminating unwanted infrared light included in the white light w, an integrator that makes the intensity distribution of the illumination light on an object to be illuminated uniform, a reflective mirror (8) that reflects light flux from the integrator (7) at a prescribed a...

A liquid crystal display device using a light source having a bright line in a visible region as a light source. On the inner surface of a transparent substrate such as a glass substrate constituting a liquid crystal display device, a laminate structure constituted by a transparent electrode, an alignment layer, and one or more transparent intermediate layers having a refractive index smaller than that of the transparent electrode layer and larger than that of the liquid crystal layer or the tra...

A color television picture reproducing device provides varying time lags to a plurality of color signals. These time lags cause an intensity modulation of a plurality of electron beams produced by at least one electron gun unit and not simultaneously concentrated on a particular point on a phosphor screen. Thus, a plurality of television pictures may be reproduced on the phosphor screen by the electron beams striking phosphors on the phosphor screen. These pictures can be made to coincide with o...

A spindle device for an automatic record changer comprising a shaft mounted in the axial bore of a spindle for elevational motion therein, and a cam attached to the shaft for elevational motion with the shaft, said cam having a constricted portion in the central portion, a major cam surface in the lower portion and a minor cam surface in the upper portion, hooks and record holders provided to move into and out of the spindle in a direction normal to the axis of the shaft as the cam and shaft mov...

A control system for a color synchronizing signal oscillator used with a magnetic color video signal recording and reproducing apparatus which prevents a color step out, when a color video signal having a timing variation is demodulated. In this system, the phases of a color burst signal of the color video signal and an output signal of a voltage control oscillator are compared with each other. A phase error voltage is produced corresponding to the phase difference between the two signals, and t...

An ultrasonic wave delay device for delaying an ultrasonic wave signal a predetermined time by propagating the ultrasonic wave signal through a solid propagation medium, in which principal signal component reflection surfaces constituting a path of propagation for principal components of the signal are arranged in the solid component propagation zone in the solid propagation medium and cause unnecessary components of the signal to escape from the principal signal component propagation zone. Refl...