Seiko Epson Corporation

Katsuhiko Maki

Takashi Kurashina

Yasuhiro Sudo

Akio Tsutsumi

Hideo Haneda

Teppei Higuchi

Kazuhiro Maekawa

Takashi Nomiya

Katsuhito Nakajima

Junichi Karasawa

Takashi Kumagai

Satoru Kodaira

Satoru Ito

Hisanobu Ishiyama

Motoaki Nishimura

Takashi Fujise

Haruo Kamijo

Shunsuke Watanabe

Yasunori Onishi

Masahiro Kanai

Koji Chindo

Shunichi Mizuochi

Kensaku Isohata

Mutsuhiko Ota

Yukihiro Hashi

Noriaki Tanaka

Hiroshi Kiya

Kiminori Nakajima

Naoki Il

Kazuhiro Adachi

Chihiro Shin

Masafumi Tanaka

Koichi Tsuhara

Rikiichi Uchino

A method for manufacturing oscillators of a plurality of types including a first oscillator and a second oscillator, the method includes: manufacturing the first oscillator, the manufacturing the first oscillator including a first-oscillator first step of mounting, to a first container, a first resonator element and a first circuit element configured to oscillate the first resonator element to generate a first oscillation signal, and a first-oscillator second step of mounting, to the first container, a second resonator element whose oscillation frequency is controlled based on the first oscillation signal; and manufacturing the second oscillator, the manufacturing the second oscillator including a second-oscillator first step of mounting a third resonator element and a second circuit element to a second container of the same type as the first container, the third resonator element being of the same type as the first resonator element and the second circuit element being of the same type as the first circuit element and being configured to oscillate the third resonator element to generate a second oscillation signal, and a second-oscillator second step of mounting, to the second container, a fourth resonator element whose oscillation frequency is controlled based on the second oscillation signal and whose frequency is different from the frequency of the second resonator element.

Method for manufacturing oscillator

A circuit device includes a time-to-digital conversion circuit, to which a first clock signal generated using a first resonator, and having a first clock frequency, and a second clock signal generated using a second resonator, and having a second clock frequency different from the first clock frequency are input, and which converts time into a digital value using the first and second clock signals, and a PLL circuit adapted to perform phase synchronization between the first and second clock signals.

Circuit device, physical quantity measurement device, electronic apparatus, and vehicle

A physical quantity measurement apparatus includes a first resonator, a second oscillator, and an integrated circuit device. The integrated circuit device includes a first oscillation circuit that causes the first resonator to oscillate, and thus generate a first clock signal having a first clock frequency, a second oscillation circuit that causes the second oscillator to oscillate, and thus generate a second clock signal having a second clock frequency which is different from the first clock frequency, and a measurement unit that is provided with a time-to-digital conversion circuit which converts time into a digital value by using the first clock signal and the second clock signal.

Physical quantity measurement apparatus, electronic apparatus, and vehicle

An atomic oscillator includes a light source unit including a light source and a first temperature control device controlling the light source to have a first temperature, an atom cell unit including an atom cell accommodating an alkali metal atom and that light emitted from the light source enters and a second temperature control device controlling the atom cell to have a second temperature different from the first temperature, and a container accommodating the light source unit and the atom cell unit and has a first surface and a second surface different from the first surface. The light source unit is mounted to the first surface, and an air gap is present between the light source unit and the second surface. The atom cell unit is mounted to the second surface, and an air gap is present between the atom cell unit and the first surface.

Atomic oscillator

A circuit device includes a clock signal generation circuit that generates a clock signal through an oscillation circuit, and a detection circuit including a circuit operating through an operation signal based on the clock signal. The clock signal generation circuit includes a first frequency adjustment unit which is capable of adjusting an oscillation frequency before an physical quantity transducer and the circuit device are connected to each other, and a second frequency adjustment unit which is capable of adjusting the oscillation frequency in a state where the physical quantity transducer and the circuit device are connected to each other.

Circuit device, electronic apparatus, moving object and method of manufacturing of physical quantity detection device

A circuit device includes a driving circuit that generates a clock signal by oscillating a vibrator, a master clock signal generation circuit that generates a master clock signal, and a master clock signal failure detection circuit that detects a failure of the master clock signal. The master clock signal failure detection circuit detects the failure of the master clock signal on the basis of an error detection clock signal, which is the clock signal from the driving circuit, and the master clock signal.

Circuit device, physical quantity detection device, electronic apparatus, and vehicle

A detection apparatus includes a first sensor for detecting rotation information of a wheel of a moving object; a second sensor for detecting angular velocity information of a rotation in a yaw axis of the wheel or angular information as yaw rotation information; and a storage unit for storing the rotation information and the yaw rotation information to be output to a processing unit for obtaining positional information of the moving object based on the rotation information and the yaw rotation information.

Detection system having wheel rotation sensors for navigation

A detection device includes: a detection circuit that performs detection processing based on a signal from a physical quantity transducer and outputs detection data; an interface that has communication connection with an external device and outputs the detection data to the external device; and a processing circuit. The processing circuit outputs the detection data acquired from the detection circuit at a common acquisition timing common to at least one other detection device and the own detection device, to the interface in a data transmitting order of own detection device.

Detection device, physical quantity measuring device, detection system, electronic device, and vehicle

A circuit device includes a first circuit, a second circuit, and a comparator array section. The first circuit has a first DLL circuit having a plurality of delay elements, and delays a first signal. The second circuit has a second DLL circuit having a plurality of delay elements, and delays a second signal. The comparator array section has a plurality of phase comparators arranged in a matrix, the first delayed signal group from the first circuit and the second delayed signal group from the second circuit are input to the comparator array section, and the comparator array section outputs a digital signal corresponding to a time difference in the transition timing between the first signal and the second signal.

A circuit device includes: a time-to-digital conversion circuit to which a first clock signal with a first clock frequency and a second clock signal with a second clock frequency different from the first clock frequency are input and that converts a time difference in transition timings of first and second signals into a digital value; and a synchronization circuit that synchronizes phases of the first and second clock signals. The time-to-digital conversion circuit calculates the digital value corresponding to the time difference by transitioning a signal level of the first signal based on the first clock signal after a phase synchronization timing of the first and second clock signals and compares the phase of the second clock signal to a phase of the second signal having a signal level is transitioned to correspond to the first signal.

Circuit device, physical quantity measurement apparatus, electronic apparatus, and vehicle

A circuit device includes a first PLL circuit to which a first clock signal having a first clock frequency generated using a first resonator and a reference clock signal are input, and which performs phase synchronization between the first clock signal and the reference clock signal, a second PLL circuit to which a second clock signal generated using a second resonator and having a second clock frequency different from the first clock frequency and the reference clock signal are input, and which performs phase synchronization between the second clock signal and the reference clock signal, and a time-to-digital conversion circuit adapted to convert time into a digital value using the first clock signal and the second clock signal.

A circuit device includes a DLL circuit and an adjustment circuit. The DLL circuit has a plurality of delay elements, and a first clock signal generated using a first resonator and having a first clock frequency is input to the DLL circuit. Delayed clock signals from the delay elements of the DLL circuit, and a second clock signal generated using a second resonator and having a second clock frequency lower than the first clock frequency are input to the adjustment circuit, and the adjustment circuit adjusts delay amounts of the delay elements of the DLL circuit using a frequency difference between the first clock frequency and the second clock frequency.

An integrated circuit device includes: a first oscillation circuit that oscillates a first resonator to generate a first clock signal with a first clock frequency; a second oscillation circuit that oscillates a second oscillation element to generate a second clock signal with a second clock frequency that is different from the first clock frequency; and a time-to-digital conversion circuit that converts a time into a digital value using the first and second clock signals.

Integrated circuit device, electronic apparatus, and vehicle

A detection device includes: a drive circuit that receives a feedback signal from a vibrator and drives the vibrator; a detection circuit that performs detection based on a signal from the vibrator and outputs detection data; and a digital signal processing unit that performs digital filtering for the detection data from the detection circuit. The digital signal processing unit performs band elimination filtering for attenuating a component of a detuning frequency &#x394;f=|fd&#x2212;fs| corresponding to a difference between a drive side resonance frequency fd and a detection side resonance frequency fs of the vibrator for the detection data.

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Chino, Japan

Katsuhiko Maki