Abstract: Disclosed is a photoelectric encoder for providing an electrical pulse signal corresponding to the rotational position and direction of a disk rotor. The encoder possesses a feedback means including a second light sensitive means and associated circuit for obtaining the stabilized output signal thereof in spite of the fluctuation of the power source voltage and/or ambient temperature or adhesion of extraneous substances to light emitting and/or sensing elements and others.

Abstract: An apparatus transposes a matrix of semiconductor pellets mounted on a first adhesive tape to a second adhesive tape in such a manner that the respective pellet rows are arranged spaced from the adjacent pellet rows. It has pellet-supporting means having an inclined plane and apical plane. The first adhesive tape bearing the matrix is carried stepwise along the inclined plane toward the apical plane to successively bring the respective rows of the matrix to the apical plane. Above the apical plane, a second adhesive tape is carried in a direction intersecting the pellet columns at right angles with the adhesive plane thereof facing the matrix. When each row mounted on the first tape is on the apical plane, the second tape is pressed against the row. Each time one pellet row is transposed to the second tape, the pellet-supporting means is shifted in a direction intersecting the pellet columns at right angles.

Abstract: One surface of a substrate of an LED module for a flat panel display has 8.times.8 element areas divided into a matrix form. Row electrodes extend on element areas arranged along the row direction, and column electrodes insulated from the row electrodes extend on element areas arranged in the column direction. At least one LED pellet is disposed for each element area and is connected to the row and column electrode associated with this area. A connecting pad is disposed as spaced apart from the four pellets in a unit area defined as a region consisting of four element areas. This connecting pad is connected to one of the row and column electrodes in the four element areas and is also connected through the substrate to a connecting pin arranged on the other surface of the substrate of the LED module.

Abstract: In a method for manufacturing a display, a substrate having a surface on which a plurality of light-emitting diodes are aligned is disposed such that the surface opposes a surface of a table. A resin of a light-emitting and electrically insulating material which is kept in a fluid state is filled by capillarity into a space defined by the surface of the substrate and the surface of the table. The resin is then hardened, and the table is removed from a hardened resin. A display is obtained wherein at least the space between the adjacent LEDs is filled with the hardened resin.

Abstract: A display device has a relatively large insulation substrate on which a metal layer is formed. On the metal layer on the insulation substrate, there are at least one pair of ceramic unit substrates which are disposed in close vicinity to each other, respectively having thereon metal layers bearing light emitting diodes. The metal layer on the insulation substrate is connected with the metal layers on the unit substrates at its end portions by means of, e.g., flexible lead frames.