Abstract: A docking apparatus comprises a drive truck adapted to run along a side wall of a dock approximately horizontally, a surface treating truck connected to the drive truck at all times and having a hull surface treating device, and a docking truck connectable to and separable from the drive truck and having a retractable hull suction disk. The drive truck only is provided with drive units for running.

Abstract: A focus detecting apparatus is disclosed which includes a focusing optical system for forming an object image on a predetermined focal plane and photoelectric devices disposed before and behind the focal plane at substantially equal distances from the plane. The photoelectric devices detect the focus states of the object images formed thereon respectively. The focus state of the object image on the focal plane is detected depending on whether or not the focus states on the photoelectric devices are equal to each other. According to the invention such a focus detecting apparatus further includes a mask for gradually decreasing the quantity of light incident upon the photoelectric devices in the direction away from the center of the incident beam. Under the action of such a mask, the focus states of object images before and behind the predetermined focal plane at substantially equal distances from the focal plane are made approximately equal to each other.

Abstract: The present invention relates to a correlation detecting device which has an analog shift register consisting of a pair of minor loops, a difference detection circuit to form signals for difference between corresponding bits thereof, and a major analog shift register to add differential outputs within a 1 minor-loop and to make 1 bit out of the same, and is so made that the maximum correlation is to be detected by bits having the minimum values out of the bits of the major analog shift register.

Abstract: A signal circuit for an automatic focusing lens is disclosed which has a displacement monitoring signal generator for generating a displacement monitoring signal representing the displacement of the lens by repeatedly turning on and off in accordance with the movement of the lens. The signal circuit is further provided with a limit signal generator for generating limit signals which represent that the lens has been moved to an infinity and a minimum-focusing-point. The displacement monitoring signal generator is connected to the limit signal generator and the output of the displacement monitoring signal is inhibited in accordance with the output of the limit signal, thereby preventing such a problem that the operation to move the lens will have been continued after the lens has been moved to the infinity or minimum-focusing-point.

Abstract: This specification discloses an energizing control of a drive element for driving a motor or the like which drives a focusing lens. The energization is controlled on the basis of the detection of whether or not the position of the focusing lens is within the quasi-in-focus state, and when the continuation of the quasi-in-focus state for a predetermined time period or more is detected, energization of the driving element is stopped.

Abstract: A battery checking device for cameras of the type having a booster circuit the output of which is fed as electrical power to a load is disclosed. In the case of the camera of the type described, when the battery voltage is checked at the output of the booster circuit, an accurate checking operation cannot be carried out. The present invention, therefore allows the voltage at the input of the booster circuit to be checked. Since another problem is that the booster circuit, after having been actuated, takes a predetermined time before its operation is stabilized, and the value of voltage as sensed during this time does not provide an accurate representation, the present invention provides that checking of that input voltage begins after the elapse of a predetermined time from the actuation of the booster circuit when the operation of the booster circuit becomes stable. Accordingly, it is made possible to achieve always an accurate and reliable battery checking operation.

Abstract: In a passive type automatic focusing device which cannot detect an in-focus state for a dark object, an auxiliary light source is used. When preparation of light emission of the auxiliary light source is completed, a photo-taking lens driver of the automatic focusing device for the photo-taking lens is activated to drive the photo-taking lens to the in-focus position.

Abstract: The disclosed automatic focusing device operates by detecting a motor signal which is produced according to the lens movement and by forming a limit signal when the motor signal is not produced for a period longer than a predetermined time. A reference signal forming circuit produces a reference signal corresponding to the shift in focus per unit time. The motor signal is compared with the reference signal and the lens drive speed is adjusted to reduce the difference between the two signals. The invention avoids a mechanical limit switch and maintains an unvarying shift in focus per unit time for different kinds of lenses.

Abstract: An automatic focusing device of a camera capable of photo-taking in infrared ray has means for detecting a focus condition of an imaging lens and correction means for producing information representing a difference between a focusing point of an image formed by a visible ray and a focusing point of an image formed by an infrared ray. The imaging lens is selectively moved to an in-focus position for the visible ray or an in-focus position for the infrared ray based on the focus information from the focus detection means and the correction information from the correction means.

Abstract: A focusing state discriminating system of the invention discriminates the focusing state of an image forming optical system, based on signals F1, F2 and F3 representing image formation states of images formed at first, second and third positions of the optical system which substantially correspond to positions slightly in front of, coincident with and slightly behind the predetermined focal plane of the image forming optical system. The operation for discrimination in this system includes at least a comparison of .vertline.F1-F3.vertline. and K(F1+F2+F3), where K is a constant.

Abstract: Disclosed is a radiation sensing system including signal accumulating type radiation sensor device having at least one radiation sensing element responsive to a radiation to produce an electrical signal, a presetting circuit for presetting the time for the accumulation of the signal by the sensor device, a first control circuit for dividing the signal accumulating time preset by the presetting circuit into a plurality of time sections discontinuous, namely, having separating periods interposed therebetween, and causing the sensor device to effect the accumulation of the produced signal of the sensing element only during each time section, and a second control circuit for reading out the accumulated signal from the sensor device after termination of the signal accumulation by the plurality of time sections.

Abstract: An automatic focusing optical apparatus comprises an automatic focusing device which automatically controls the focal point of an optical system and is arranged to be operatable in such a manner that, once the optical system is focused on an object, the focal point of the optical system is fixed to be unvarying irrespectively of changes in the distance to the object; a display device which is capable of displaying the in-focus and defocus states of the optical system independently of the automatic focusing device; and control means for allowing the display device to display solely the in-focus state when the automatic focusing device fixes the focal point of the optical system to be unvarying irrespectively of changes in the distance to the object after the optical system is once focused on the object.

Abstract: In a still-picture camera using a servo-like automatic focusing device, the automatic focusing device is locked and inhibited from operating when a shutter release is performed. The invented arrangement permits the use of a servo-like automatic focusing device for a still-picture camera without impairing operability. Furthermore, the invention permits selection of a servo-like automatic focusing function or a one-shot focusing function which is effected during a sequence of steps on an member such as a release operation member, so that the automatic focusing functions can be selected by utilizing the operability of the still-picture camera without impairing the operability thereof.

Abstract: An in-focus state detecting device which is provided with erroneous signal discriminating means is arranged such that: The lens cap of a photo-taking lens has the whole surface or a part of the surface thereof formed into a diffuse transmission face. With this lens cap put on the photo-taking lens, a light flux is allowed to be diffused by the diffuse transmission face to obtain a uniform brightness face at the cap. Then, a light flux from the uniform brightness face of the cap is guided to the in-focus detecting device to perform a checking operation with the discriminating means to check for an erroneous action of the device.

Abstract: This invention relates to a camera capable of automatic focusing by displacing a focusing lens in an interchangeable lens in accordance with a focusing signal obtained from focus detecting elements for receiving the light passing through said interchangeable lens, and provides a device capable of maintaining a constant driving force per unit time for said focusing lens even when the moving characteristics of the focusing lens varies among different interchangeable lenses.

Abstract: In the device disclosed, an image formed by an optical system is scanned by an image sensor composed of independently arranged photoelectric transducing elements to produce an image scanning signal. A detecting circuit detects the variation of the brightness between the adjacent image elements as a measure of the sharpness of the image and the focus of the optical system. The focus detection accuracy is improved by non-linear transformation of the brightness variation signal with a non-linear transformation circuit that weighs the brightness variation signal on the basis of the signal level.

Abstract: A focusing device for an optical system detects a continuous photographing state and allows no focusing operation when a degree of defocus exceeds a prescribed value during the continuous photographing operation.

Abstract: In the disclosed focus adjusting device, at least part of an image forming optical system and a focus adjusting mechanism is arranged within a housing attachable to and detachable from a camera body. A focus condition detector includes a photo-sensor disposed on a plane corresponding to the camera image plane, an electrical detection circuit connected to the photo-sensor, and a detecting optical system for forming an image of at least a part of the object on the surface of the photo-sensor. An aural indicator emits a sound to inform a photographer of the condition of the image formed on the surface of the predetermined focal plane as determined by the focusing condition detector.

Abstract: A focus detecting system detects an image formation state of an image of an object by processing a time-serial output from a photoelectric transducer element through a high-pass filter. In order to suppress the outputs from the high-pass filter corresponding to the time-serial signal at the initial moment of light reception by the photoelectric transducer element or immediately thereafter, an amplifier is provided which performs the initial setting of the high-pass filter. The input and output ends of the amplifier are connected to parts of the high-pass filter, and the output impedance of the amplifier may be changed in response to a signal from an external source.

Abstract: In the disclosed focus detecting system, the focusing condition of an objective lens relative to an object is determined by a number of pairs of radiation sensitive elements arranged in a linear array, and a number of lens elements arranged in a linear array corresponding to the linear array of the pairs of radiation sensitive elements. Each lens element is disposed so that one radiation sensitive element in each pair of radiation sensitive elements is arranged to cause one radiation sensitive element in each pair of radiation sensitive elements to receive radiation from a first portion of the objective lens and to cause the other radiation sensitive element to receive radiation from a second portion of the objective lens.