51 results about "Radio clock" patented technology

A piezoelectric vibrator includes a base substrate, a lid substrate, a piezoelectric vibrating reed, a pair of external electrodes, a pair of through electrodes, and routing electrodes. The base substrate is made of a glass material and a bonding film is formed on the upper surface of the base substrate. The lid substrate is made of a glass material, includes a recess for a cavity, and is bonded to the base substrate with the bonding film interposed therebetween so that the recess faces the base substrate. The piezoelectric vibrating reed is bonded to the upper surface of the base substrate so as to be received in a cavity that is formed between the base substrate and the lid substrate by the recess. The pair of external electrodes is formed on the lower surface of the base substrate. The pair of through electrodes is formed so as to pass through the base substrate, maintains airtightness in the cavity, and is electrically connected to the pair of external electrodes, respectively. The routing electrodes are formed on the upper surface of the base substrate, and are electrically connected to the piezoelectric vibrating reed bonded to the pair of through electrodes.

Time signals for controlling a radio clock are transmitted by a transmitter and received by a receiver as amplitude modulated time signals, formed of a multitude of time frames. Each time frame has a constant duration. These time signals are first automatically amplified. A so-called telegram of at least one received time signal is stored in a memory. At least one change of an amplitude of a time signal is determined in advance or predetermined and such amplitude change has a duration that is longer than a given or determined duration (Δt). When a predetermined amplitude change begins the automatic amplification is locked-in. The present circuit arrangement for operating a radio-controlled clock is equipped with components for performing the foregoing operations.

Provided are: a piezoelectric oscillation piece which has a pair of oscillation arms disposed in parallel with each other with base ends of the oscillation arms fixed to a base of the piezoelectric oscillation piece and with weight metal films formed at the tips of the oscillation arms; a base substrate on the upper surface of which the piezoelectric oscillation piece is mounted; a lid substrate joined with the base substrate such that the mounted piezoelectric oscillation piece can be accommodated in a cavity; and a control film disposed in the vicinity of the pair of the oscillation arms as viewed in the plan view and formed at least on either of the substrates in such a manner as to extend from the base end side to the tip side in the longitudinal direction of the oscillation arms for increasing the degree of vacuum inside the cavity by heating. The control film is locally deposited on the side surfaces of the oscillation arms in the vicinity of the control film by heating.

A method for extracting time information from a received, amplitude-modulated time signal is provided. The method provides that the time signal is demodulated, the analog signal thus obtained is digitized by a comparator, and the digital signal thus obtained is analyzed to extract the time information. In addition, a characteristic value of the time duration of at least one signal phase of a specific signal level of the digital signal is compared to a target value, and a comparator threshold of the comparator is altered as a function of a result of the comparison such that the time duration of at least the applicable signal phase of the digital signal approaches the target value. In this way, an improved system sensitivity is achieved according to the invention in a receiver for receiving time signals. In particular, the frequency of occurrence of errors due to misreading of pulse lengths is reduced here, and distorted received signals are better detected as being distorted on account of their temporal deviation from the applicable target value. In addition, compensation of manufacturing tolerances of the various components in the described circuit arrangement is possible.

A piezoelectric vibrator manufacturing method includes a cavity forming step for forming depressions for a cavities on at least one of two wafers; a bonding electrode film forming step for forming bonding electrode films on bonded surfaces of the both wafers; a mount pattern forming step for forming a pair of mount patterns in the cavity; a through hole forming step for forming a pair of through holes in the cavity; a through electrode forming step for forming a pair of through electrodes electrically connected with the pattern in the cavity; a mount step for electrically connecting the pattern and a piezoelectric vibrating strip, a superimposing step for superimposing the both wafers and storing getter materials; a bonding step for anodically bonding the both wafers to fabricating a wafer member; a gettering step for adjusting the degree of vacuum in the interior of the cavity while measuring a series resonance resistance value; and a cutting step for cutting the wafer member into individual pieces.

There is provided a piezoelectric vibrator 1 that includes a base substrate 2, a lid substrate 3, a piezoelectric vibrating reed 4, a pair of external electrodes 38 and 39, a pair of through electrodes 32 and 33, and routing electrodes 36 and 37. The lid substrate 3 includes a recess 3a for a cavity and is bonded to the base substrate so that the recess faces the base substrate. The piezoelectric vibrating reed 4 is bonded to the upper surface of the base substrate so as to be received in a cavity that is formed between both the substrates. The pair of external electrodes 38 and 39 is formed on the lower surface of the base substrate. The pair of through electrodes 32 and 33 is formed by hardening paste P, which contains a plurality of metal fine particles and a plurality of metal beads P1, so as to pass through the base substrate, maintains airtightness in the cavity, and is electrically connected to the pair of external electrodes, respectively. The routing electrodes 36 and 37 are formed on the upper surface of the base substrate and electrically connect the pair of through electrodes to the piezoelectric vibrating reed. The melting point of the metal bead is higher than the firing temperature of the paste.

The present invention is enabling to easily solder again in soldering of a surface mount type piezoelectric vibrator. An external electrode is formed by an alloy metal of Cr and Ni, namely, NiCr. Further, on the surface of NiCr, an oxidation resistant film for oxidation resistance is formed by a film of Au. Therefore, in the structure of an external electrode, the layer of NiCr is formed on the surface of glass, and further, the layer of Au is formed thereon. In the meantime, NiCr and Au are deposited by spattering (a spatter method) as a film with a low stress. In the external electrode of such a structure, the layer of Au is dispersed in the solder by soldering, however, since Cr in NiCr reduces the diffusion speed of Ni into the solder, Ni is remained in the external terminal. Since Ni is a metal to make the alloy metal with the solder, it is possible to perform soldering again by removing this quartz crystal vibrator.

Disclosed is a time information obtaining device comprising: a reception section to receive a standard time radio wave; an input waveform data generation section to generate input waveform data, based on data having the unit of time length; an estimated waveform data generation section to generate estimated waveform data, wherein the estimated waveform data comprises the value in which each sample point is described by the plurality of bits, and has the same time length as the input waveform data, and comprises at least one code which configures the time code, and a waveform of the estimated waveform data is sequentially shifted by a predetermined sample; a correlation value calculation section to calculate a correlation value; a correlation value comparison section to compare the correlation value to calculate an optimal value; and a control section to specify a beginning position of a second in the time code.

There is There is provided a method of manufacturing a package 1 having a base substrate 10 and a lid substrate 20 bonded to each other and both formed of a glass base material; and a cavity C formed between the both substrates for storing an encapsulated object 2 in a state of being hermetically encapsulated, including: a depression forming step for forming a depression C1 for a cavity which defines the cavity when the both substrates are superimposed to each other on at least one of the both substrates; and a bonding step for superimposing the both substrates so as to store the encapsulated object in the depression and then bonding the both substrates to encapsulate the encapsulated object in the cavity, characterized in that in the depression forming step, printed layers 12 are laminated on an upper surface of a flat plate-shaped glass base material 11 in a frame shape in plan view by screen printing, and then the printed layers and the glass base material are baked at the same time to form the depression.

There is provided a piezoelectric vibrator 1 that includes a base substrate 2, a lid substrate 3, a piezoelectric vibrating reed 4, a pair of external electrodes 38 and 39, a pair of through electrodes 32 and 33, and routing electrodes 36 and 37. Both surfaces of the base substrate 2 are polished. The lid substrate 3 includes a recess 3a for a cavity C and is bonded to the base substrate. The piezoelectric vibrating reed 4 is bonded to the upper surface of the base substrate so as to be received in a cavity that is formed between the base substrate and the lid substrate. The pair of external electrodes 38 and 39 is formed on the lower surface of the base substrate. The pair of through electrodes 32 and 33 is formed so as to pass through the base substrate, maintains airtightness in the cavity, and is electrically connected to the pair of external electrodes, respectively. The routing electrodes 36 and 37 are formed on the upper surface of the base substrate and electrically connect the pair of through electrodes to the bonded piezoelectric vibrating reed. The through electrodes are formed by the hardening of paste that contains a plurality of nonspherical metal fine particles.

A radio clock including: an antenna configured to receive a satellite signal transmitted from GPS satellite; a receiving unit configured to perform a receiving process to acquire information contained in the satellite signal received by the antenna within a predetermine upper limit period; and a control unit configured to change the number of receiving processes to be performed in a predetermined period and change the upper limit period in accordance with a total sum of durations of the receiving processes performed in the predetermined period.

A method of fabricating a case accommodating a piezoelectric vibrating piece therein in a piezoelectric oscillator including the piezoelectric vibrating piece, including the steps of: applying deep drawing to a conductive plate member to shape the plate member in a nearly cylindrical shape with a bottom; pressing an inner surface of a bottom part of the plate member by a punch for step drawing while an outer surface of the bottom part is being abutted against a surface including an opening of a hole of a die having an inner diameter smaller than the outer diameter of the bottom part, whereby a projecting portion is formed on the outer surface of the bottom part; and cutting the plate member having the projecting portion at a predetermined position on the opening side thereof, whereby a case in a nearly cylindrical shape with a bottom having the projecting portion is obtained.

A radio clock including: an antenna configured to receive a satellite signals transmitted from a plurality of GPS satellites; a receiving unit configured to perform a receiving process to acquire information tram a satellite signal received by the antenna, the information being contained in the satellite signal; and a control unit configured to control the receiving unit to keep synchronized with the GPS satellite that has transmitted the satellite signal and control the receiving unit to receive a satellite signal containing date information for date correction when the information acquired by the receiving unit does not contain the date information.

The circuit (4) has a reception input to receive a time signal carrying encoded time information. An amplifier circuit amplifies the signal to produce an amplified time signal, and includes an adjustable amplifier with a variable amplification factor that is adjusted depending on frequency of the received time signal. An adjustable bandpass filter filters the amplified time signal to produce a filtered amplified time signal. Independent claims are also included for the following: (A) a radio-controlled clock including a receiver circuit (B) a method of acquiring time information.

The invention provides a wireless clock synchronization method without a central base station, a system and a medium, comprising the following steps: a base station domain dividing step: dividing eachbase station to obtain a divided base station domain; base station domain clock synchronization step: according to the divided base station domain, clock synchronization parameters corresponding to each base station in the base station domain are allocated to synchronize clock information of each base station in the base station domain. The invention can realize precise synchronization of clocksbetween base stations in a Tsync time period. The invention can solve the problems of low synchronization precision and clock out-of-step after synchronization and the like existing in the prior art.The invention can realize the dynamic division of the base station domain, and solve the problems of dynamic discrimination, decomposition and combination of the smallest base station domain when thebase station is dynamically increased, decreased or moved.

An anodic wafer bonding method according to the present invention is an anodic wafer bonding method for bonding a first substrate formed of an insulating material or a dielectric material and a second substrate which can be anodically bonded by applying a voltage to a bonding film formed of a conductive material formed between the substrates in a state in which the first substrate and the second substrate are laminated, in which the voltage is applied to the bonding film from a plurality of points at the time of anodic wafer bonding.

A receiving device includes: an antenna to which a communication signal containing time information is inputted; a ground allowing the antenna to function; a conductive part; a gain characteristics change unit which interrupts continuity between the ground and the conductive part to change the gain characteristics of the antenna; a receiving unit which obtains the time information from the communication signal inputted to the antenna; and a control unit which commands the gain characteristics change unit to interrupt the continuity and commands the receiving unit to obtain the time information. When the time information cannot be obtained from the communication signal inputted to the antenna having a certain type of gain characteristics, the control unit commands the gain characteristics change unit to interrupt the continuity and commands the receiving unit to obtain the time information from the communication signal inputted to the antenna whose gain characteristics have been changed.

A method of fabricating a hermetic terminal includes: joining and firing wherein a bar-shaped member to be a lead is inserted into a ring, and they are fired to form a hermetic terminal intermediate having the bar-shaped member fixed in the ring; flattening wherein an end part of the bar-shaped member to be the inner lead portion of the lead is flattened to form a stair portion; and shaping wherein an end part of the stair portion is cut to shape the stair portion into a predetermined shape, wherein in the joining and firing step, a solid round bar longer than the lead is used as the bar-shaped member, and one end side of the bar-shaped member to be the inner lead portion is inserted into the ring so that the one end side is longer than the inner lead portion in the hermetic terminal as a completed product.