Canon Kabushiki Kaisha

Nihon Kohden Corporation

Nikon Corporation

Kenta Sudo

Hirofumi Abe

Takayuki Kaneko

Masayuki Shiraishi

Yoshimoto Suzuki

Shinji Yamasaki

Yu Inomoto

Masakazu Kodaira

Takahisa Ishikawa

Yosuke Tatsuzaki

Yoshiaki Nakao

Kazuteru Yanagihara

Kazuki Someya

A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power. A distance between adjacent lens units changes during zooming. The first lens unit includes two cemented lenses and each of the two cemented lenses includes a positive lens. Predetermined conditions are satisfied by the zoom lens.

Zoom lens and image pickup apparatus

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a subsequent unit. The first lens unit is configured not to move for zooming. A distance between each pair of adjacent lens units changes in zooming. A predetermined condition is satisfied.

The zoom lens includes, in order from object side to image side, a positive first lens unit, a negative second lens unit, a positive third lens unit, and a rear lens group including at least one lens unit, in which intervals between adjacent lens units are changed during zooming. The third lens unit includes at least two negative lenses and at least three positive lenses. An average value of partial dispersion ratios of two negative lenses having strongest refractive powers of the at least two negative lenses, an average value of partial dispersion ratios of three positive lenses having strongest refractive powers of the at least three positive lenses, an average value of Abbe numbers of the two negative lenses, an average value of Abbe numbers of the three positive lenses, a back focus, and a focal length of zoom lens at wide angle end are appropriately set.

Zoom lens and image pickup apparatus having the same

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and one or more rear lens units. The first lens unit does not move for zooming. An interval between each pair of adjacent lens units changes in zooming. The first lens unit includes a positive lens made of material with an Abbe number less than 30. A predetermined condition is satisfied.

A biological signal acquirer is attached to a subject and acquires a biological signal of the subject. A transmitter carried by the subject transmits the biological signal. A first communication port and a first camera are installed in a first location and connectable to a network. A second communication port and a second camera are installed in a second location and connectable to the network. A biological information acquiring device is connectable to the network and provided with a switcher. The switcher acquires, when communication establishment between the transmitter and the first communication port is detected, the biological signal through the first communication port as well as a first image taken by the first camera, and acquires, when communication establishment between the transmitter and the second communication port is detected, the biological signal through the second communication port as well as a second image taken by the second camera.

Biological information acquiring system

A dome cover for covering a camera, the dome cover includes a spherical part and an aspherical part. The spherical part and the aspherical part have a boundary, where the spherical part and the aspherical part are adjacent to each other, on each of a front surface and a back surface of the dome cover. The aspherical part has a shape symmetrical with respect to a rotation around a rotation axis including a center of a sphere of the spherical part. On a section including the rotation axis, a distance from the rotation axis to the aspherical part increases as a position of the aspherical part becomes more distant from the boundary, an angle formed between the rotation axis and a line segment connecting the center of the sphere and the boundary on the front surface is less than 90&#xb0;. A predetermined condition is satisfied.

Dome cover, image pickup apparatus, and image pickup system

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; and a third lens unit having a positive refractive power. The first lens unit does not move and the second lens unit and the third lens unit move in mutually different loci during zooming. Conditional expressions are satisfied as follows:0.05&#x3c;|2/2|&#x3c;0.59, and0.20&#x3c;|3/3|&#x3c;1.95,where f2 is a focal length of the second lens unit, f3 is a focal length of the third lens unit, m2 is a moving amount of the second lens unit during zooming from a wide-angle end to a telephoto end, and m3 is a moving amount of the third lens unit during zooming from the wide-angle end to the telephoto end.

Zoom lens, image pickup apparatus including the same, and control device for the same

A transmission device can be carried by the subject. A biological signal recording device can perform wireless communication with the transmission device. A transmitter transmits biological signal data corresponding to a biological signal of a subject. A storage stores the biological signal data. A receiver receives the biological signal data. A recorder records the biological signal data received by the receiver. A detector detects a missing portion in the biological signal data recorded by the recorder or a receipt of the biological signal data by the receiver. A notifier notifies the missing portion or transmits an acknowledgment of the receipt to the transmission device. A complementary transmitter retrieves biological signal data corresponding to the notified missing portion from the storage or identifies unreceived biological signal data and retrieves the identified biological signal data, and transmits the retrieved biological signal data. A complementary recorder records the biological signal data transmitted by the complementary transmitter.

Biological signal recording system

Provided is an optical system comprising a cemented lens including a positive lens, a negative lens, and an optical element cemented to the positive lens and the negative lens in which the optical element is made of an ultraviolet curing resin. An internal transmittance at a wavelength of an ultraviolet ray at which the ultraviolet curing resin is cured per thickness of 10 mm of a material for a first lens which is arranged on an object side out of the positive lens and the negative lens, and a minimum value and a maximum value of a thickness of the first lens in an optical axis direction are appropriately set.

Optical system, and image pickup apparatus and image pickup system including the same

A zoom lens includes, in order from an object side to an image side: a negative first lens unit; a negative second lens unit; and a positive third lens unit, in which the first lens unit is not moved for zooming, the second lens unit and the third lens unit are moved during zooming, and an interval between each pair of adjacent lens units is changed during zooming, in which the first lens unit includes at least two negative lenses, and a focal length of the first lens unit, a focal length of the zoom lens at a wide angle end, a focal length of the zoom lens at a telephoto end, an interval on an optical axis between the first lens unit and the second lens unit at the wide angle end, and a back focus at the wide angle end are appropriately set.

Zoom lens and image pickup apparatus including the same

Provided is an eyepiece lens to be used for observing an image displayed on an image displaying surface, the eyepiece lens consisting of, in order from the image displaying surface side to an observation side: a first lens unit having a negative refractive power; and a second lens unit having a positive refractive power. The first lens unit consists of one negative lens, and the second lens unit consists of, in order from the image displaying surface side to the observation side, a positive lens and a negative lens that has a concave surface facing the observation side. During adjustment of a diopter, the first lens unit is configured to not move, and the second lens unit is configured to move.

Eyepiece lens, observation apparatus including the eyepiece lens and image pickup apparatus including the eyepiece lens

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a rear lens group including one or more lens units, and an aperture stop. During zooming, with the first lens unit not moving, the second lens unit and at least one of the lens units of the rear lens group move. In this zoom lens, the configuration of the third lens unit and the location of the aperture stop are appropriately set.

In a zoom lens including a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power that are arranged in order from an object side to an image side, a movement locus of each of the lens units, an amount of movement of the third lens unit when zooming from a wide angle end to a telephoto end, and a focal length of the third lens unit are set as appropriate.

An alignment device is provided for aligning a primary mirror with a secondary mirror in an optical system having the primary mirror and the secondary mirror arranged so as to face each other along the optical axis. The alignment device has a dichroic film formed on a surface on the front side of the secondary mirror and configured to reflect light used in the optical system and to transmit alignment light, a back reflecting surface formed on the back side of the secondary mirror and configured to reflect the alignment light, and a detection system which detects a positional deviation between the primary mirror and the secondary mirror, based on the alignment light having traveled via the dichroic film, the back reflecting surface, and a reflecting surface of the primary mirror.

Alignment device and method for optical system

A measurement apparatus and a receiver apparatus are communicatively connected in a wireless manner. Biological signal data is obtained from a detector attached on a living body. A data packet is prepared from the biological signal data. A first CRC of the biological signal data is calculated and appended to the data packet. The data packet is periodically transmitted with the first CRC from the measurement apparatus to the receiver apparatus. A second CRC of the data packet received at the receiver apparatus is calculated. The received data packet is verified when the second CRC is coincident with the first CRC. Acknowledgement data is transmitted from the receiver apparatus to the measurement apparatus when the received data packet is verified. The data packet is retransmitted from the measurement apparatus to the receiver apparatus when the acknowledgement data is not received at the measurement apparatus within a prescribed time period from a previous transmission of the data packet. The data packet is stored in a storage when the number of retransmission exceeds a prescribed value.

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Tokyo, Japan

Kenta Sudo