Abstract: In a camera wherein a lens cap is detachably attached there are provided first and second photometric sensors on a lens barrel and the camera main frame, respectively. It is detected in accordance with the photometric values by the first and second photometric sensors whether the lens cap is mounted. According to the camera, it is possible to detect with great accuracy whether the lens cap is mounted, with a standard type lens cap.

Abstract: A distance measurement device has a taking lens, a viewfinder, distance measurement elements for performing distance measurement in a plurality of areas on an object, a memory for storing the positional relationship between the field of view of the viewfinder and the distance measurement areas of the distance measurement elements, a selector for selecting one of the distances measured in the plurality of areas in accordance with the positional relationship stored in the memory, and a controller for adjusting the focus of the taking lens in accordance with the distance selected by the selector.

Abstract: An image sensing device provided in a camera using an electro-developing recording medium which electronically develops an image formed by a photographing optical system. During descending of the electro-developing recording medium, a light outputted from a light source passes through the electro-developing recording medium, so that an image recorded in the electro-developing recording medium is read by a line sensor. When an image is recorded on the electro-developing recording medium, the line sensor is directed to a sub-mirror provided to a quick return mirror. Thus, a light led from the photographing optical system is detected by the line sensor, so that an auto-focusing condition of the photographing optical system is sensed based on an output signal of the line sensor.

Abstract: A camera having a range finder in accordance with the present invention has a range finder comprising a CPU responsible for overall control, a range finding unit in which two light-receiving lenses, two sensor arrays, a switching circuit, and an integration circuit are incorporated, a light projection LED, and an AF IC. The switching circuit is used to change the destination of outputs of the sensor arrays to an A/D conversion circuit, whereby range finding is carried out in a passive AF mode. Moreover, the switching circuit is used to change the destination of outputs of one sensor array to the AF IC, whereby range finding is carried out in an active AF mode. According to the present invention, a compact and inexpensive camera having the ability to carry out range finding in two modes and capable of properly measuring a distance to any of objects lying in a wide area can be realized.

Abstract: The invention eliminates field mask eclipse related to a focal detection apparatus that uses a phase variation detection method, and provides an adjustment device and method for the focal detection apparatus. The focal detection apparatus includes a field mask; a separator optical system that divides and forms a set of light images of a beam of light transmitted through the field mask; an image sensor that photoelectrically converts light images from the separator optical system; a light-receiving area memory device; a masking device that masks the photoelectric output of the image sensor according to the light-receiving areas written into the light-receiving area memory device; and a focal computation device that computes a defocusing amount from the photoelectric output masked by the masking device.

Abstract: A photometric device, to measure light incident from a photographic lens of a camera, which can perform accurate photometry, independently of the direction of polarization of the incident light. The photometric device is provided with a first semi-transparent mirror, located between the photographic lens and an imaging plane of the camera, for dividing incident light from the photographic lens into a reflected beam and a transmitted beam. A second semi-transparent mirror is located in a position where the reflected beam from this first semi-transparent mirror is incident, and divides the incident light into a reflected beam and a transmitted beam. A photometric unit, for performing photometry, is located in a position to receive light of the transmitted beam from the second semi-transparent mirror.

Abstract: In a distance measuring apparatus, a light-detecting portion in a trigonometric distance measuring apparatus using a passive method is also used as a light-detecting portion for photometry processing. Thus, the luminance range for distance measurement is widened. The distance measuring apparatus includes two light-detecting portions arranged in correspondence with two optical systems. Correction filters for luminous efficacy correction is arranged in the optical paths of each optical system covering halves of the corresponding light-detecting portions.

Abstract: A camera body has at least one opening formed in a front position thereof for receiving optical information about a subject. A remote control light sensor is provided within the camera body to receive a remote control light signal emitted from an external remote control transmitter. An optical unit is placed between the opening and the remote control light sensor to direct at least the remote control light signal onto the light sensor. A control unit is responsive to an output of the remote control light sensor to control a predetermined operation associated with the camera body.

Abstract: An optical apparatus comprises a zoom lens for effecting magnification change, a focusing lens for effecting focus adjustment, a first motor for moving the focusing lens, a second motor for moving the zoom lens, and detecting mechanism for detecting the reference positions of the focusing lens and the zoom lens, the detecting mechanism being used in common to the two lenses.

Abstract: A lens cap in a camera is shaped so as to cover a distance measuring optical system when it is mounted on a taking lens. A photodiode array as a light receiving element for measurement of distance is utilized to obtain a luminance level of the light incident thereto, and it is compared with a luminance level obtained through a light receiving element for photometry. If a difference between the two luminance levels is large, a predetermined cap alarm process is carried out as determining that the lens cap is mounted on the taking lens. Thus, photography is surely prevented in a mounting state of the lens cap.