Abstract: A lens barrel comprises: a first focus ring used for either one of instruction types of focus operation of a relative position instruction type focus operation for moving a position of the focus lens for focus control and an absolute position instruction type focus operation for moving it in an absolute positional relation; a second focus ring used for the focus operation of the instruction type different from that of the first focus ring between the relative position and the absolute position instruction type focus operation; a support device which slidably supports the first focus ring; a connecting device which brings the first focus ring and the second focus ring from an unconnected state into a connected state when the first focus ring is slid from a first position to a second position; and a cover member covering the outer circumference portion of the second focus ring.

Abstract: An antireflection film includes a multilayer film having six layers, in total, provided between an optical substrate and an adhesion layer. The respective layers of first to sixth layers are laminated in order from one side of the adhesion layer. A refractive index of the antireflection film as a whole is lower than that of the optical substrate and higher than that of the adhesion layer. The first and third layers are low refractive index layers having a refractive index of 1.35 to 1.50 at d line. The second, fourth and sixth layers are middle refractive index layers having a refractive index of 1.55 to 1.85 at the d line. The fifth layer is a high refractive index layer having a refractive index, at the d line, that is in a range of 1.70 to 2.50 and that is higher than that of the middle refractive index layer.

Abstract: An O-ring 12 is disposed on an image-side second outer peripheral surface 11—1b, which is subjected to a smoothing process, of a taking lens 11—1. The O-ring 12 is pressed by an inner surface 13a of a lens frame 13 toward the second outer peripheral surface 11—1b.

Abstract: An adjustment amount of a brightness level is determined for each pixel of an image based on the value of each pixel of a luminance distribution image which represents the distribution of luminance of the image. A portion contributing to adjustment of brightness and a portion contributing to adjustment of saturation are determined for each pixel of the image so that the sum thereof is equal to the adjustment amount of the brightness level. Then, an adjustment value of saturation, which is obtained by weighting the value of each pixel in the image based on the portion contributing to saturation, and an adjustment value of brightness, which is obtained by weighting the value of each pixel in the luminance distribution image, which corresponds to each pixel of the image, based on the portion contributing to brightness are added to the value of each pixel of the image.

Abstract: An optical element to be measured is irradiated with the light which has passed through an indicator, thereby to form an indicator image on an image pick-up surface. Maximum peak coordinates are specified and stored as a position of the indicator image relating to the first surface. Whether the second largest peak may be specified or not is determined. In case that this result is NO, the maximum peak indicator image is deleted, and maximum peak coordinates are specified again and stored as a position of the indicator image relating to the second surface.

Abstract: A lens aperture-adjustment device of a closed circuit television camera for capable of switching between automatic and manual adjustments of lens aperture is provided. The device includes a geared motor for driving aperture blades of a lens aperture mechanism; a drive circuit for driving the geared motor in response to a first drive signal for automatic adjustment or a second drive signal for manual adjustment; a comparison circuit for making a comparison between a lightness information signal responsive to the imaging environment and a first reference signal and outputting the first drive signal; a differential amplifier to which a manual adjustment signal entered by an operator and a second reference signal for defining the limit value of the drive amount of the geared motor are input, the differential amplifier for outputting the second drive signal; and a selection circuit for connecting the first drive signal or the second drive.

Abstract: An imaging apparatus includes a light source unit that selectively outputs white light and light in a different wavelength band to an observation target, an imaging unit including an imaging device, and a spectral image formation circuit that generates a spectral image signal for a specified wavelength by an operation using an image signal based on an output from the imaging unit and predetermined matrix data. The imaging unit selectively obtains an image of the observation target for each of first, second and third light components in a visible light region and an image for each of at least fourth and fifth light components in a near-infrared region. Further, the imaging unit includes first spectral devices that make only the first and fourth light components enter first pixels of the imaging device and second spectral devices that make only the second and fifth light components enter second pixels thereof.

Abstract: Provided is a lens apparatus in which serial communication and parallel communication between a camera body and the lens apparatus are performed and resumption of the serial communication is accomplished after occurrence of a communication error, and controlling of a controlled object being controlled through the parallel communication is transferred to temporally controlling through the serial communication, in which, by setting a state of the controlled object when the controlling is transferred to controlling through the serial communication, to be coincident with a state during controlling through the parallel communication, the controlled object to be controlled through the parallel communication is not affected by an effect caused due to a communication error in the serial communication.

Abstract: An imaging lens is provided and includes: in order from an object side of the imaging lens, a first lens group having a positive power as a whole; a second lens group, in which an object-side surface of a lens closest to the object side is concave toward the object side; a third lens group of a single lens having a positive power; and a fourth lens group having a negative power as a whole.

Abstract: A stringing preventing member is provided and includes: a member having an opening portion through which resin injected from an injection nozzle of an injection molding apparatus is fed to a mold including a fixed mold and a movable mold; and a projection portion protruding inwardly with respect to an opening of the injection nozzle, so as to define at least a part of a contour of the opening portion. A ratio of an effective opening area of the opening portion to a surface area of an inner wall surface of the opening portion contacting with the resin at an inside of the opening potion is 0.6 or less, and a ratio of the effective opening area of the opening portion to an area of the opening of the injection nozzle is 0.6 or more.

Abstract: The present invention provides an AF-area display apparatus integrated in a lens unit that is interchangeably mounted on a camera and has an automatic focusing device for controlling focusing in such a way that the camera is focused on a photographic subject within an AF area in an imaging area of the camera, or connected as an auxiliary device to the lens unit, the AF-area display apparatus comprising: an AF-area obtaining device that obtains the AF area currently set in the automatic focusing device; a video signal generating device that generates a video signal for displaying the AF area obtained through the AF-area obtaining device; and a video signal outputting device that outputs the video signal generated by the video signal generating device.

Abstract: A plastic lens, which does not require a modification to an inner diameter of a mirror frame but is uniform in outer diameter, is provided and include: protrusions on the circumference in at least three points divided thereof into three equal parts except for an injection gate point, in positions equally distant to a center O of the plastic lens. The protrusions have respective outer surfaces provided as fit portions to a mirror frame. The plastic lens preferably has a diameter of 50 mm or more and a thickness smallest at the center thereof.

Abstract: The present invention provides a lens barrel having an optical system capable of change of a focal length, comprising: a diaphragm device which controls a light amount of light incident to the optical system and passing to an image forming surface; and an open F value varying device which is provided separately from the diaphragm device, controls a light amount of the light incident to the optical system and passing to the image forming surface and varies an open F value by limiting the light amount so that the open F value becomes a value according to a focal length of the optical system when the light amount which is controllable by the diaphragm device is at the maximum.

Abstract: It is an object to provide a small ultrasonic actuator whose voltage control is easy. The ultrasonic actuator acts on a rotatable rotor to rotate the rotor, the ultrasonic actuator includes: a plate vibrator having one end which contacts the rotor, a corner portion bent at a midpoint in the vibrator, and the other end which is fixed; and a piezoelectric device which contacts a part of the vibrator between the one end and the corner portion, and transmits a vibration to the vibrator by vibrating in response to application of an alternating voltage between one of electrodes provided respectively on both surfaces or the plate vibrator serving as the one of the electrodes and the other of the electrodes.

Abstract: An antireflection film is disposed on a surface of an optical substrate, and consists of first to tenth layers to stacked sequentially from the opposite side to the optical substrate. The first layer, the fourth layer and the ninth layer are low-refractive index layers made of a low-refractive index material exhibiting a refractive index of 1.35 to 1.50 with respect to the d-line. The third layer, the fifth layer, the seventh layer and the tenth layer are intermediate-refractive index layers made of an intermediate-refractive index material exhibiting a refractive index of 1.55 to 1.85 with respect to the d-line. The second layer, the sixth layer and the eighth layer are high-refractive index layers made of a high-refractive index material exhibiting a refractive index that is in a range from 1.70 to 2.50 with respect to the d-line, and that is higher than the refractive index of the intermediate-refractive index material.

Abstract: A lens device, in which object light is branched by a half mirror after passing through a photographic lens to allow photographing with two photographing means and in which the half mirror can be retracted from the optical axis to obtain a clear image using one of the photographing means, is provided. The half mirror in the lens device is provided between a front-side relay lens and a rear-side relay lens, and is provided such that the half mirror can be retracted away from an optical axis of the photographic lens and advanced toward from the optical axis. The rear-side relay lens is moved along the optical axis to a position in accordance with the retracting of advancing of the half mirror.

Abstract: A projection zoom lens device includes, in order from a magnification side, a negative first group G1 and positive second to fifth groups (G2 to G5) and is configured so that the second group G2, the third group G3, and the fourth group G4 are moved along an optical axis toward the magnification side during zooming from a wide-angle end state to a telephoto end state. Also, a lens L4, being closest to the magnification side, of the second group G2 is formed of a negative lens, and the fifth group G5 includes a single positive lens.

Abstract: An endoscope comprises: an insertion portion that is to be inserted into a coelom; a treatment instrument elevation support, pivotally provided at a distal end of the insertion portion, that is used to guide a treatment instrument introduced at the distal end; and an observation section that obtains an image observed at the distal end, wherein, when the treatment instrument elevation support is reclined, part of the treatment instrument elevation support is included in the image obtained by the observation section.

Abstract: An electronic endoscope apparatus comprises: a processor unit; and an electronic endoscope having a solid-state pickup element, the electronic endoscopes being capable of connecting to the processor unit, so as to generate digital picture signals, wherein the processor unit comprises a differential signal outputting portion that generates digital picture signals corresponding to a pixel number of the solid-state pickup element and corresponding to a display standard for an external computer, parallel-serially converts the digital picture signals, and outputs the converted signals as differential signals, and wherein the electronic endoscope apparatus further comprises a high-definition television system converter that detects the pixel number of the digital picture signals based on the differential signals, converts the digital picture signals to high-definition television signals based on the detected number of pixels and outputs the high-definition television signals, the high-definition television system c

Abstract: A surface plasmon resonance measuring apparatus is provided with a dielectric block, a metal film formed on a surface of the dielectric block, a light source for emitting a light beam, an optical system for making the light beam enter the dielectric block at various angles of incidence so that a condition for total internal reflection is satisfied at an interface between the dielectric block and the thin film layer, and a photodetector for detecting the intensity of the light beam satisfying total internal reflection at the interface. In the measurement chip to be utilized in the surface plasmon resonance measuring apparatus, the dielectric block is formed from a synthetic resin in which, when said light beam is p-polarized outside said dielectric block and then strikes the interface, the intensity of a s-polarized component at the interface is 50% or less of the intensity of the light beam at the interface.