Abstract: A positioning device according to the present invention includes a movable body; a position detection unit detecting a position of the movable body; a first and a second vibratory actuator controlled in accordance with a detection output from the position detection unit; a first transmission mechanism comprising a first gear wheel and a first rack engaging the first gear wheel, the first transmission mechanism transmitting a driving force of the first vibratory actuator to the movable body; and a second transmission mechanism comprising a second gear wheel and a second rack engaging the second gear wheel, the second transmission mechanism transmitting a driving force of the second vibratory actuator to the movable body. An engaging position of the first gear wheel with the first rack is different from an engaging position of the second gear wheel with the second rack.

Abstract: A lens meter according, including: a unit body provided with eyeglasses support means for supporting eyeglasses; a left measurement optical system provided in the unit body and provided with a left light-emitting optical system that emits measurement light to a left eyeglass lens of the eyeglasses and a left light-receiving optical system that receives the measurement light passing through the left eyeglass lens with a CCD (light-receiving element); a right measurement optical system provided in the unit body and provided with a right light-emitting optical system that emits measurement light to a right eyeglass lens of the eyeglasses and a right light-receiving optical system that receives the measurement light passing through the right eyeglass lens with the CCD. (light-receiving element); and an arithmetic control circuit that performs operation to the optical characteristics of a pair of the eyeglass lenses based on an output of the CCD (light-receiving element).

Abstract: There is provided a position control apparatus and method for a table member which is capable of controlling the positioning of the table through very small displacement thereof, to thereby prevent the position of the table from deviating even when a disturbance such as vibration is applied to the table. A table member is movable relative to the base member in a predetermined direction. A threaded shaft is rotatably mounted on a base member and elastically deformable when twisted. A motor is coupled to one end of the threaded shaft, for rotating the threaded shaft to displace the table member. A pressurizing and fixing member is arranged in the vicinity of a location where the motor is coupled to the threaded shaft, for pressurizing the threaded shaft to be fixed in position.

Abstract: A lens meter according, including: a unit body provided with eyeglasses support means for supporting eyeglasses; a left measurement optical system provided in the unit body and provided with a left light-emitting optical system that emits measurement light to a left eyeglass lens of the eyeglasses and a left light-receiving optical system that receives the measurement light passing through the left eyeglass lens with a CCD (light-receiving element); a right measurement optical system provided in the unit body and provided with a right light-emitting optical system that emits measurement light to a right eyeglass lens of the eyeglasses and a right light-receiving optical system that receives the measurement light passing through the right eyeglass lens with the CCD (light-receiving element); and an arithmetic control circuit that performs operation to the optical characteristics of a pair of the eyeglass lenses based on an output of the CCD (light-receiving element).

Abstract: Disclosed are a spectacle lens optical characteristics measuring method and a lens meter in which measurement beams are not intercepted by lens pressers. The left and right lenses of a pair of spectacles are point-supported by lens rest shafts at some midpoints in the optical paths of a pair of left and right measurement optical systems, and the spectacle frame for the lenses is held by a pair of frame retaining plates from the front and rear sides. In this state, the spectacle lenses are pressed against lens rest shafts by lens presser shafts to be thereby supported, whereby the way the spectacle frame is held by the frame retaining plates is corrected.

Abstract: The present invention relates to a vibration wave motor which is configured to prevent abnormal noise from being produced at a start time or a stop time and, more particularly, to a control device for a vibration wave motor which obtains a driving force by applying a periodic voltage to an electro-mechanical energy conversion element so as to generate in a vibration member thereof a plurality of standing waves having a phase difference therebetween, the plurality of standing waves being synthesized to generate a driving vibration in the vibration member.

Abstract: There is provided a position control apparatus and method for a table member which is capable of controlling the positioning of the table through very small displacement thereof, to thereby prevent the position of the table from deviating even when a disturbance such as vibration is applied to the table. A table member is movable relative to the base member in a predetermined direction. A threaded shaft is rotatably mounted on a base member and elastically deformable when twisted. A motor is coupled to one end of the threaded shaft, for rotating the threaded shaft to displace the table member. A pressurizing and fixing member is arranged in the vicinity of a location where the motor is coupled to the threaded shaft, for pressurizing the threaded shaft to be fixed in position.

Abstract: The present invention has been devised in order to raise driving efficiency of the vibration wave driving apparatus. A vibration member of a vibration wave driving apparatus of the present invention comprises the vibration member constituted of an elastic member and an electromechanical energy conversion element, and a rotor contacting the vibration member, and the vibration member generates a travelling wave in the elastic member when an alternating signal is applied to the electromechanical energy conversion element, in which an electrode film provided on a surface of the electromechanical energy conversion element of the vibration member is divided into a plurality of circular areas with different radiuses and each circular area is divided into a plurality of electrodes along its peripheral direction.

Abstract: A wavefront sensor includes a plurality of lenses disposed in the same plane, and an area sensor that receives a bundle of rays of light collected through each of the lenses as a luminous point. Each of the lenses comprises a plurality of concentric areas with different focal lengths, and the area sensor is located substantially halfway between a first position in which a plane wave forms an image after passing through one of the concentric areas with a minimum focal length, and a second position in which the plane wave fronts an image after passing through another area with a medium focal length. With the wavefront sensor thus arranged, the measurement can be always achieved with high accuracy without involving noticeable blurring of luminous points on the area sensor regardless of the wavefront shape of a light beam indent to the lenses.

Abstract: A refracting power measuring apparatus according to the present invention comprises an optical system 1 for projecting a measuring light P toward a lens TL wet with liquid 12, a light receiving sensor 7 for receiving and outputting the measuring light P which passes through the lens TL, an arithmetic circuit 13 for calculating optical characteristic values based on a receiving signal, a residual quantity arithmetic circuit 14 for outputting a residual quantity signal based on characteristic value data of the arithmetic circuit 13, a delay circuit 19 for delaying the residual quantity signal, a comparing circuit 18 which compares a residual quantity signal delayed by the delaying circuit 19 and the following residual quantity signal and judges whether a difference therebetween is less than an allowed value.

Abstract: A lens meter according, including: a unit body provided with eyeglasses support means for supporting eyeglasses; a left measurement optical system provided in the unit body and provided with a left light-emitting optical system that emits measurement light to a left eyeglass lens of the eyeglasses and a left light-receiving optical system that receives the measurement light passing through the left eyeglass lens with a CCD (light-receiving element); a right measurement optical system provided in the unit body and provided with a right light-emitting optical system that emits measurement light to a right eyeglass lens of the eyeglasses and a right light-receiving optical system that receives the measurement light passing through the right eyeglass lens with the CCD (light-receiving element); and an arithmetic control circuit that performs operation to the optical characteristics of a pair of the eyeglass lenses based on an output of the CCD (light-receiving element).

Abstract: A lens specifying apparatus comprising a light source (21) for projecting a measuring light beam on a lens (30) under examination, an area CCD (35) image receiving element for receiving the measuring light beam transmitted by the lens (30) under examination, a filter disc (64) disposed, as means for providing spectral transmittances, at a midpoint of an optical path extending from the light source (21) to the area CCD (35), and a processing circuit (37) for calculating the refractive characteristics and spectral transmittances of the lens (30) under examination on the basis of an output of the area CCD (35) and displaying the refractive characteristics and spectral transmittances on a monitor (3).

Abstract: The present invention relates to a vibration wave motor, and more specifically a vibration wave motor which is configured to prevent abnormal noise from being produced at a start time by setting a voltage to be applied to the motor at a motor driving time at a first voltage lower than a voltage for usual driving and gradually changing the voltage from this condition to a specified voltage for the usual driving for driving the motor.

Abstract: A wavefront sensor includes a plurality of lenses disposed in the same plane, and an area sensor that receives a bundle of rays of light collected through each of the lenses as a luminous point. Each of the lenses comprises a plurality of concentric areas with different focal lengths, and the area sensor is located substantially halfway between a first position in which a plane wave forms an image after passing through one of the concentric areas with a minimum focal length, and a second position in which the plane wave forms an image after passing through another area with a maximum focal length. With the wavefront sensor thus arranged, the measurement can be always achieved with high accuracy without involving noticeable blurring of luminous points on the area sensor regardless of the wavefront shape of a light beam incident to the lenses.

Abstract: A lens specifying apparatus comprising a light source (21) for projecting a measuring light beam on a lens (30) under examination, an area CCD (35) image receiving element for receiving the measuring light beam transmitted by the lens (30) under examination, a filter disc (64) disposed, as means for providing spectral transmittances, at a midpoint of an optical path extending from the light source (21) to the area CCD (35), and a processing circuit (37) for calculating the refractive characteristics and spectral transmittances of the lens (30) under examination on the basis of an output of the area CCD (35) and displaying the refractive characteristics and spectral transmittances on a monitor (3).

Abstract: A lens meter is provided which comprises a light source for generation of a measuring light beam and a pattern forming plate provided in an optical path of the measuring light beam. The pattern forming plate has a central pattern for measuring lens characteristics of a narrow area on an eyeglass lens and a plurality of peripheral patterns for measuring lens characteristics of a wide area on the eyeglass lens. The pattern forming plate can be switched between a normal measuring mode which receives the image of the central pattern based on the measuring light beam transmitted through the narrow area of the eyeglass lens and also measures the narrow area alone and displays the measured values and a wide-area measuring mode which receives a great number of images of the peripheral patterns based on the measuring light beam transmitted through the wide area of the eyeglass lens and also measures the wide area and performs mapping display.

Abstract: A lens meter having a projection system (5) provided with a projection light source (7) adapted to project a measuring beam onto a lens (14) to be examined, and a light receiving system (6) provided with a light receiving element (15) adapted to receive the measuring beam which has passed through the test lens (14), the optical characteristics of the test lens (14) being determined on the basis of a position in which the light receiving element (15) receives the measuring beam which has passed through the test lens, comprising a test lens turning mechanism (16) adapted to turn the test lens (14) around a center (0) of a turning movement corresponding to that of a turning movement of an eyeball in a spectacle lens-worn state.

Abstract: A lens meter is provided which includes a light source portion which emits measuring light having at least three different wavelengths; a light receiving portion which receives the measuring light which has passed through a to-be-inspected lens immersed in a liquid as a medium; an in-medium optical characteristic measuring device for measuring an optical characteristic of the lens in the medium about each wavelength, based on a deviated quantity of the measuring light detected by the light receiving portion; a refractive index calculating device for calculating a refractive index of material of the lens, based on a difference of the optical characteristic of the lens in the medium among the wavelengths; and a converting device for converting the optical characteristic of the lens in the medium into an optical characteristic of the lens in the air, based on the refractive index calculated by the refractive index calculating device.

Abstract: A lens meter is provided in which a measurement light beam emitted from a light source (21) is projected onto a lens (L) to be inspected, an amount in travel of the measurement light beam which has passed through the lens (L) is then detected by a TV camera (34), and the refractive characteristics of the lens (L) based on the detection result are computed by an arithmetic and control circuit (35) and are displayed by a display unit (3). In the lens meter, the arithmetic and control circuit (35) computes cylindrical power of a distance portion (40) of the lens (L) in consideration of cylindrical power and a direction of a cylindrical axis from the detection result of the TV camera (34), and then computes cylindrical power in distortion areas (42, 43) except the distance portion (40), a progressive portion (41), and a near portion (41') in consideration of the cylindrical power and the direction of the cylindrical axis.

Abstract: On a monitor (52) there is displayed a synthesized image (G4) in which an image (G1) of a subject lens showing a refractive power distribution, an image (G2) of a lens frame, and an eyepoint mark image (G3) are superimposed based on the refractive power distribution data of the subject lens by a lens meter (100), on the frame shape data of the lens frame by a frame shape measurement apparatus (200), and on the eyepoint data by an eyepoint measurement apparatus (300).