Abstract: Disclosed is a resin composition for an optical material which contains a base polymer (A), a photopolymerizable compound (B), and a photopolymerization initiator (C). Also disclosed is a resin film for an optical material which is made of such a resin composition for an optical material. Specifically disclosed is a resin composition for an optical material which has high transparency and high heat resistance, while enabling formation of a thick film with high precision. This resin composition is particularly useful for a resin film which is used for forming optical waveguides. Also specifically disclosed are a resin film for an optical material using such a resin composition and an optical waveguide using such a resin film.

Abstract: An electronic piano is controllable with a remote controller; since the remote controller is physically separated from the electronic piano, users are liable to mislay the remote controller somewhere around the electronic piano; in this situation, the user instructs the electronic piano to transmit a radio wave representative of inquiry, and the missing remote controller responds to the inquiry by transmitting a radio wave representative of annunciation; the electronic piano is equipped with antennas separated from each other on the piano cabinet, and the received power at the antennas is varied depending upon the location of the missing remote controller; the electronic piano analyzes the received power so as to notify the user of the possible location of the missing remote controller.

Abstract: There is disclosed a network unauthorized access preventing system in which in a network to which one or more information processing apparatuses and a network unauthorized access preventing apparatus are connected, an unauthorized apparatus which is not authorized to access the network is prevented from accessing the network. The system includes an information processing apparatus which sends a correct ARP response packet to the unauthorized apparatus in response to an ARP request broadcast from the unauthorized apparatus, and a network unauthorized access preventing apparatus which sends an ARP response packet containing a false MAC address as the MAC address of the information processing apparatus to the unauthorized apparatus immediately after the correct ARP response packet is sent to the unauthorized apparatus.

Abstract: A music box includes daisy reed wheels, the reeds of which are respectively associated with player's fingers, and the player's fingers are selectively energized for plucking the reeds for generating tones; the reeds of the daisy reed wheels form reed groups respectively assigned to tones, and a controller selects reeds from the reed groups in such a manner that any one of the reeds of each group is not plucked with the player's finger, whereby the controller prevents the vibrating reeds from the plucking.

Abstract: An electronic piano is controllable with a remote controller; since the remote controller is physically separated from the electronic piano, users are liable to mislay the remote controller somewhere around the electronic piano; in this situation, the user instructs the electronic piano to transmit a radio wave representative of inquiry, and the missing remote controller responds to the inquiry by transmitting a radio wave representative of annunciation; the electronic piano is equipped with antennas separated from each other on the piano cabinet, and the received power at the antennas is varied depending upon the location of the missing remote controller; the electronic piano analyzes the received power so as to notify the user of the possible location of the missing remote controller.

Abstract: A music box includes daisy reed wheels, the reeds of which are respectively associated with player's fingers, and the player's fingers are selectively energized for plucking the reeds for generating tones; the reeds of the daisy reed wheels form reed groups respectively assigned to tones, and a controller selects reeds from the reed groups in such a manner that any one of the reeds of each group is not plucked with the player's finger, whereby the controller prevents the vibrating reeds from the plucking.

Abstract: A keyboard instrument selectively enters into an acoustic sound mode for performing a music with acoustic piano sounds and an electronic sound mode for performing a music with synthetic sounds, and a rotary stopper is provided between hammer shanks and strings for interrupting a rotation of the hammer toward the strings in the electronic sound mode; wherein a cushion is provided on the rotary stopper for damping an impact of a damper leaving from the strings in both acoustic and electronic sound modes so that a player can perform a music without a noise.