Abstract: A portable type distance measuring apparatus which comprises an apparatus main body 11 having a distance measuring unit for measuring a distance by projecting a distance measuring light 30, a control unit for controlling the distance measuring unit and for processing measurement data from the distance measuring unit and a transmitting unit to emit a communication light including the measurement data to a distance measuring direction, and a target unit having a display unit 13, an operation unit 14 and a photodetection unit 15 for receiving the communication light, wherein the target unit is removably mounted on the apparatus main body so that the target unit may be used as an object to be measured for distance measurement when necessary.

Abstract: The present invention relates to a distance measuring apparatus having an attenuation filter for adjusting luminous energy of a luminous flux incident on light receiving converting means. An object of the present invention is to provide a distance measuring apparatus in which at least a part of the attenuation filter is arranged as deflection means. According to the arrangement of the distance measuring apparatus of the present invention, a light projecting system irradiates a measuring luminous flux toward an object under measurement, a light receiving system receives the reflected luminous flux reflected on the object under measurement and leading the reflected light to light receiving converting means, and a distance from a position at which measurement is carried out to a position at which the object under measurement is located, is measured based on the reflected luminous flux received by the light receiving converting means.

Abstract: The invention particularly relates to a mixing apparatus using an eccentric phase plate, and an optical rangefinder using the mixing apparatus. In the optical rangefinder, an external distance measurement optical path leads light from the light source to a light receiving part passing through an article to be measured, an internal distance measurement optical path leads the light from the light source to the light receiving part not passing through the article to be measured, and processing means calculates the distance to the article to be measured from the difference between the distance value obtained by the external distance measurement optical path and the distance value obtained by the internal distance measurement optical path. In the mixing apparatus, driving means drives the phase plate.

Abstract: An optical pulse observing device enables the clear observation of indirect laser light of pulse laser light. The optical pulse observing device to be used by a user for observing pulse illumination light directly or indirectly, includes an optical shutter means that operates for alternate opening and closing in synchronism with periodic pulses of the pulse laser light so as to open only during the duration of pulses of the pulse laser light to pass pulse laser light and external light.

Abstract: A portable type distance measuring apparatus which comprises an apparatus main body 11 having a distance measuring unit for measuring a distance by projecting a distance measuring light 30, a control unit for controlling the distance measuring unit and for processing measurement data from the distance measuring unit and a transmitting unit to emit a communication light including the measurement data to a distance measuring direction, and a target unit having a display unit 13, an operation unit 14 and a photodetection unit 15 for receiving the communication light, wherein the target unit is removably mounted on the apparatus main body so that the target unit may be used as an object to be measured for distance measurement when necessary.

Abstract: A distance measuring system, wherein the distance measuring unit comprises a reflection light beam optical path leading to a photodetection unit, the photodetection unit 7 for receiving a reflection light beam from an object to be measured, an optical member provided on the optical path of the reflection light beam and used for deflecting the reflection light beam toward the photodetection unit, and a deflector 50 arranged on a surface of the optical member and used for deflecting the reflection light beam tilted with respect to the normal optical path toward the photodetection unit.

Abstract: The tilt detecting device of the present invention comprises a light transmission type electric bubble tube, a light source for emitting detection light to the electric bubble tube, a photodetector element for detecting emitted light amount for detecting an amount of light emitted from the light source, and a tilt detection control unit for controlling the emitted light amount of the light source to a constant level based on photodetection signal from the photodetector element for detecting emitted light amount, and causes of error are eliminated.

Abstract: The present invention provides a distance measuring device for measuring a distance, comprising a light emitting unit for emitting a measuring light beam toward an object to be measured, and a photodetection unit for receiving a reflected measuring light beam reflected from the object to be measured, wherein said distance measuring device comprises a gain control unit for changing photodetection sensitivity of said photodetection unit by a bias voltage and a light amount switching unit for variably changing a light amount of the light emitting element which emits the light beam toward the photodetection unit.

Abstract: The present invention relates to a laser light-source apparatus and a method of producing a laser beam, and particularly to a laser light-source apparatus capable of generating intermittent pulse light having a predetermined flickering time and emphasizing the brightness of its peak by a Bartley effect. A timing circuit forms a timing signal so as to allow an excitation type laser light source to produce the intermittent pulse light having the predetermined flickering time. A pumping laser pumps the excitation type laser light source based on the signal outputted from the timing circuit. The intermittent pulse light is flickering slower than a flicker value of a normal person in cycle. The time required to put out the intermittent pulse light is set to a time or so required to restore the sensitivity of each of human eyes to the maximum sensitivity after the human eyes have felt brightness since light has been launched into the human eyes.

Abstract: A laser system for surveying, which comprises a laser light source unit, an optical system for irradiating a laser beam from the laser light source unit toward a given direction, whereby said laser light source unit is at least thermally isolated from the optical system, and the laser beam from the laser light source unit is guided toward the optical system by an optical fiber. Because the laser light source unit, or at least a heat generating portion of the light source unit is isolated from the optical system, no influence of heat from the laster light source unit is exerted on the optical system, and it is possible to prevent decrease of accuracy due to heat and to maintain the laser system for surveying in a condition to provide measurement at high accuracy.

Abstract: A laser apparatus employing a semiconductor laser or the like, and a method of controlling the laser apparatus capable of controlling an driving a temperature control unit on the basis of the sum of the respective power consumptions of the temperature control unit and a driving means so that the laser apparatus operates at a minimum power consumption. The temperature control unit included in a laser oscillator heats or cools a nonlinear optical medium, a temperature detecting means detects the temperature of the nonlinear optical medium, a power consumption detecting unit detects the respective power consumptions of the temperature control unit and the driving means, and a processing means controls and drives the temperature control unit on the basis of the sum of the respective power consumptions of the temperature control unit and the driving means.

Abstract: The present invention relates to a laser beam emitting apparatus using a semiconductor laser or the like and a method of driving a laser light source. An object of the present invention is particularly to provide a laser beam emitting apparatus capable of controlling a laser output with efficiency and a method of driving a laser light source. The laser beam emitting apparatus comprises an optical resonator, the laser light source and pulse driving means. The optical resonator comprises at least a laser crystal and an output mirror. The laser light source pumps the optical resonator and the pulse driving means drives the laser light source. The pulse driving means can change the period and the duty ratio or the like of a drive pulse or pumping pulse so as to control a laser output produced from the laser beam emitting apparatus.

Abstract: The present invention relates to a laser beam emitting apparatus employing a semiconductor laser or the like and, more particularly, to a laser beam emitting apparatus capable of operating at low power consumption. A Peltier device driving unit of the present invention drives a Peltier device included in the laser beam emitting apparatus provided with an optical resonator having at least a laser crystal and an output mirror. A switching regulator generates a voltage corresponding to the duty factor of a pulse width modulator. An H-bridge changes the flowing direction of a current supplied to the Peltier device. The H-bridge comprises p-channel FETs, and n-channel FETS connected in parallel with the p-channel FETS.

Abstract: The present invention relates to a rotating laser beam irradiating apparatus, and more particularly to a rotating laser beam irradiating apparatus which, by synchronizing an emission timing of a pulse laser with a rotation of an irradiating means, makes it possible to describe intermittent dot-shaped marks, to tremendously increase a visual recognition distance, and to enlarge a work area; wherein a pulse driving means drives a pulse laser light source, and an irradiating means irradiates an irradiated object with a pulse laser light beam from the pulse laser light source, and a rotation driving means rotates the irradiating means, and a rotation detecting means detects the rotation of the irradiating means, and an arithmetic processing means, in accordance with a driving timing from the pulse driving means and a detection signal from the rotation detecting means, controls the rotation driving means to synchronize an emission timing of the pulse laser with the rotation of the irradiating means.

Abstract: The present invention relates particularly to a laser irradiation light detecting device having detecting means for receiving a reflected light pencil of a laser light pencil applied from a laser irradiating device provided with a non-linear optical medium for generating a second harmonic. A laser light source pumps an optical resonator and a pulse driving means drives the laser light source. An irradiating means applies a pencil of pulse laser light produced from a laser oscillating device to a target device. A detecting means detects a light pencil reflected from the target device. An arithmetic processing means executes predetermined operations, based on the signal detected by the detecting means. The detecting means detects the reflected light pencil of the pulse laser light pencil in synchronism with a period T of a driving pulse of the pulse driving means.

Abstract: The present invention relates to a laser oscillating apparatus using a semiconductor laser or the like and a method of driving a laser beam source. The present invention relates particularly to a laser oscillating apparatus or the like having a nonlinear optical medium for generating a second harmonic and capable of by-pulse driving a laser beam source with high efficiency. In the laser oscillating apparatus, a optical resonator is composed of at least a laser crystal and an output mirror. The nonlinear optical medium for generating the second harmonic is inserted into the optical resonator. The laser beam source can effect pumping on the optical resonator so that the period T of a drive pulse produced from a pulse driving means satisfies a relation in .tau..sub.FL >T-.tau. with respect to .tau..sub.FL (fluorescence lifetime).

Abstract: A laser system for surveying, which comprises a laser light source unit, an optical system for irradiating a laser beam from the laser light source unit toward a given direction, whereby said laser light source unit is at least thermally isolated from the optical system, and the laser beam from the laser light source unit is guided toward the optical system by an optical fiber. Because the laser light source unit, or at least a heat generating portion of the light source unit is isolated from the optical system, no influence of heat from the laser light source unit is exerted on the optical system, and it is possible to prevent decrease of accuracy due to heat and to maintain the laser system for surveying in a condition to provide measurement at high accuracy.

Abstract: In a light-wave distance meter, a light source device emits reference modulated light beams from multiple spatially-separated light emitting areas, an optical means radiates a light beam derived from the multiple modulated light beams to the target of measurement, a light beam reception means receives the reflected return light beam from the target and converts it into an electrical pulse signal, and a distance measuring means calculates the distance to the target based on the time difference between the light beam emission and the return light beam reception. The low coherence and high intensity light beam produced by the light source device enables the extension of the maximum measurable distance.

Abstract: High resolution measuring systems use a continuous series of laser pulses in measuring distance to an object. An approximate time difference between transmitted and reflected pulses is derived. A second, more accurate, time difference is derived through use of a reference signal sampled in correlation to the pulse signal in order to derive a sampled waveform signal having a period which is long relative to the period of the pulse signal. Phase difference measurements of this sampled waveform provide delay time measurements of high accuracy. The high accuracy and approximate time difference signals are combined to determine time difference between measurement pulses with increased resolution. Time difference is converted to precision distance measurments, with greater accuracy available by averaging several measurements. Several embodiments are described.

Abstract: A light wave distance measuring instrument uses a light receiving diode for receiving both light from a light source diode coupled via an internal light passage and light from the light source diode coupled via an external light passage. A beam splitter separates light pulses from a single source diode to supply light pulses for both internal and external passages. A reference signal is sampled using detected signals representing the timing of received internal reference light pulses and external measurement light pulses to provide first and second signals with phase difference representing measured distance. These signals are processed in a CPU for calculating distance with reduced errors due to frequency drift.