Abstract: A tracking servo device for changing a position on an optical storage disk, at which the storage disk is irradiated by a light beam. The servo device is responsive to a tracking error signal indicative of a deviation of the irradiated position on the disk with respect to a recording track provided on the disk. The tracking servo device includes an optical deflector element having a waveguide disposed in a path of the light beam, for guiding the light beam therethrough toward a surface of the optical storage disk, so as to deflect the light beam during propagation thereof through the waveguide. The device further has a deflection control arrangement for controlling an angle of deflection of the light beam by the optical deflector element, based on the tracking error signal.

Abstract: In order to record information from a compact disc apparatus to an automatic reversing cassette tape recorder without any loss of the information, the compact disc player (22) and the cassette tape recorder (13) are synchronously started by a reproducing start control means (21). When the cassette tape comes to one end, a tape end detection means (10) issues a pulse, making the compact disc player pause for a 1-2 sec. time period. This period is longer than the time period required for reversing the cassette tape recorder so the compact disc player (22) does not reproduce the information direction change, by the cassette tape recorder (13), while the tape continues. This prevents loss of information reproduced by the compact disc player (22) during the tape reversing.

Abstract: In an optical pickup device comprising an optical detector which is divided into first, second and third regions for detection of a light beam reflected from a disk, the detector is arranged in such a manner that the first region is located between the second and third regions and has a width determined so that the effects of diffracted light of the tracks on the disk are cancelled. Optical means give astigmatism and other aberrations to the light beam applied to the optical detector. A differential amplifier receives a first signal outputed by the first region and a second signal which is the sum of the output signals of the second and third regions, to form a focus error signal. Gain control means control the gain of at least one of the first and second signals to eliminate the resultant offset between the first and second signals. Thus, focus servo can be carried out with high accuracy at all times.

Abstract: In an apparatus for optically reproducing the recorded information, a circuit to reproduce an RF signal is provided. At least a pair of photo sensors are arranged adjacently in a direction parallel with a tangential line of a recording track of an information recording disc. A light beam is irradiated onto the recording surface of the disc and the reflected light from the recording surface is received by these photo sensor. The phases of both output signals of the photo sensors are made coincident by the phase shift means. The resultant output signals having the same phase are added thereby to form the RF signal. For this purpose, the phase difference between both output signals of the photo sensors is detected and either one of phases of the output signals is shifted in accordance with the phase difference detecting output.

Abstract: The present invention relates to an automatic telephone answering device with an automatic switching mechanism for switching between an automatic answering mode and a two-way conversation recording mode. When a telephone is put into an off-hook condition for a direct conversation with a calling party while the automatic answering mode is in a standby condition or in operation, such an off-hook condition is detected by a current detector and the conversation is recorded on a recording tape without any limitation of time. When the telephone is put into an on-hook condition during the recording of the conversation, the current detector or a voice signal detector is operated to stop the recording operation, and then the device is automatically brought into a standby condition for the next call.

Abstract: A communication terminal apparatus includes a telephone circuit for generating a detection signal in response to a received calling signal in an automatic receiving mode, and a control unit for transmitting an answer-back tone signal in response to the detection signal from the telephone circuit. After transmitting the answer-back tone signal, in response to externally supplied DTMF signals representing a data input start signal, key-in data, and a data input end signal, the control unit sequentially stores the key-in data in a memory and drives a printer on the basis of the key-in data stored in the memory.

Abstract: An electronic dispatch board for use with a voice message recording-playback machine. The dispatch board lights certain lamps responsive to signals sent from the message recording-playback machine when a message has been placed in a certain voice mailbox. The dispatch board is comprised of a serial-to-parallel converter, a board address comparator, an address signal verifier, a lamp driver, and a plurality of lamps. The address signal verifier determines if a valid address signal has been received from the message recording machine. A number of dispatch boards may be simultaneously connected to the same message recording machine. The board address comparator in each dispatch board determines if the address signal from the message recording machine is meant for that particular dispatch board. If a valid address signal has been received, a certain lamp is set to an on, off or blink state.

Abstract: An information reading apparatus for reading information includes a board having a plane optical waveguide and a light source on the board. Light beam emitted from the source is conducted by a first optical system to a predetermined direction through the waveguide. Part of the light beam is deffracted toward a second optical system by a surface elastic wave region formed in the waveguide. The second optical system conducts the light beam to an information recording region of a card through the waveguide and leads reflected light beam from the information recording region to a photodetector. The light beam not diffracted by the elastic wave region is conducted to a third optical system formed in the waveguide. The system conducts the light beam to a synchronizing signal recording region of the card and leads reflected light beam from the synchronizing signal recording region to a photodetector.