Abstract: A zone for measuring distance is enlarged by adding an area where a contrast ratio is relatively high in the case of the photographing against the light. Thus, the sensitivity for judging a contrast ratio is increased and improper focusing is prevented. The brightness when an evaluative value is a maximum and the brightness at a moment when the evaluative value is not at maximum, for example when it is at a minimum, are compared. If the difference of brightness becomes too large, the maximum evaluative value is ignored and the detection is repeated. The determination of when the difference in brightness is too large is made to be dependent on parameters such as gain of the AGC circuit, gain of the amplifier and iris opening which affect the noise in the evaluative value so as to more accurately judge when the when the maximum evaluative value should be ignored.

Abstract: An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus information detected by analyzing a light that passes through a photographic lens. In case a focal length of the photographic lens moves out of a range wherein the set image magnification can be obtained, various options, such as a shutter-release lock operation, can be executed depending upon the chosen design of the camera.

Abstract: An eye direction detecting apparatus for a camera having a light transferring system for guiding a beam of parallel light rays to an eye of a photographer includes a light receiving system having a light receiving portion on which a first Purkinje image based on specular reflection of a cornea of the eye and reflecting light from a retina of the eye is formed, the light receiving portion generating a light receiving output. The apparatus further includes a processing circuit for detecting the eye direction of the eye based on the light receiving output of the light receiving portion. Further, according to the teachings of the present invention, including an optical member having certain identically inclined surfaces prevents refracted light from forming a ghost image within the light receiving system of an eye direction detecting apparatus.

Abstract: An eye direction detecting apparatus for a camera having a light transferring system for guiding a beam of parallel light rays to an eye of a photographer includes a light receiving system having a light receiving portion on which a first Purkinje image based on specular reflection of a cornea of the eye and reflecting light from a retina of the eye is formed, the light receiving portion generating a light receiving output. The apparatus further includes a processing circuit for detecting the eye direction of the eye based on the light receiving output of the light receiving portion. Further, according to the teachings of the present invention, including an optical member having certain identically inclined surfaces prevents refracted light from forming a ghost image within the light receiving system of an eye direction detecting apparatus.

Abstract: An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus information detected by analyzing a light that passes through a photographic lens. In case a focal length of the photographic lens moves out of a range wherein the set image magnification can be obtained, various options, such as a shutter-release lock operation, can be executed depending upon the chosen design of the camera.

Abstract: A lens accommodation device for a camera employing a lens unit that is interchangeably mounted to a camera body. The lens unit provides data to the camera body as to whether the photographic lens thereof is accommodatable. If the lens is accommodatable, the photographic lens of the lens unit is driven in a direction in which the photographic lens is accommodated when a predetermined condition occurs.

Abstract: An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus infomation detected by using a light having passed through a photographic lens.In case focal length of the photographic lens comes out of a range wherein the set image magnification can be obtained, various operations such as shutter-release lock operation are executed depending upon designs.

Abstract: An eye direction detecting apparatus for a camera having a light transferring system for guiding a beam of parallel light rays to an eye of a photographer includes a light receiving system having a light receiving portion on which a first Purkinje image based on specular reflection of a cornea of the eye and reflecting light from a retina of the eye is formed, the light receiving portion generating a light receiving output. The apparatus further includes a processing circuit for detecting the eye direction of the eye based on the light receiving output of the light receiving portion. Further, according to the teachings of the present invention, including an optical member having certain identically inclined surfaces prevents refracted light from forming a ghost image within the light receiving system of an eye direction detecting apparatus.

Abstract: A differential value of a characteristic curve of a focus distance of a zooming lens versus a position of a focus lens is calculated or found from a table in a contrast or phase difference type auto focus mechanism by detecting a high frequency part of an image signal. A follow-up speed of a focus lens is stepped or continuously changed based on the differential value. A focus position of a focus lens can therefore be changed smoothly corresponding to displacement of a focus distance of a zooming lens. A current brightness and a brightness when the evaluative value is peak is compared. If a brightness difference is large, a peak is not recognized and processing is repeated. Also, a gain of an amplifier is reduced corresponding to a linear-, step- or curve characteristic of a focus position of the focus lens versus a focus distance of the zooming lens when a gain of an AGC circuit is relatively high, so that noise is a high frequency part is reduced.

Abstract: An autofocusing system in the nacro zone of a photographic lens is arranged so that the photographic lens having a zooming zone and a macro zone is provided with a first lens group driven by a first drive means and a second lens group driven by a second drive means, wherein the first lens group is driven for focusing in the zooming and macro zones, whereas the second lens group is driven for zooming in the zooming zone, the second lens group being driven for focusing in the macro zone before the first lens group is thus driven.

Abstract: An auto optical focus detecting device of a camera comprises a center zone being located in a center of a view finder of a camera body; at least two peripheral zones being located in the view finder, one of the two peripheral zones center zone and the other being located in the left-hand side; the camera body containing a center auto focus optical system and at least two peripheral auto focus optical systems; the center auto focus optical system having a zone corresponding to the center zone, the zone being substantially conjugate with the center zone; the peripheral auto focus optical systems, respectively, having a substantially conjugate zone corresponding to the peripheral zone, each zone being substantially conjugate with the peripheral zone; a photographic lens being attached to the camera body, an exit pupil of the photographic lens being looked through the center zone of the center auto focus optical system, at least two aperture zones being defined on the exit pupil by the at least two peripheral aut

Abstract: An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus information detected by using a light having passed through a photographic lens. In case focal length of the photographic lens comes out of a range wherein the set image magnification can be obtained, various operations such as shutter-release lock operation are executed depending upon designs.

Abstract: A broad band pass filter and a narrow band pass filter are provided. The broad band pass filter detects a moving direction of the focus lens certainly and a peak of the evaluative value rapidly. And then, the band pass filter means is switched to the narrow band pass filter. The narrow band pass filter confirms whether a detected peak is correct or not. It is compared with a brightness when the evaluative value is peak and a brightness at a moment mhe the evaluative value is not peak, for example, an evaluative value is minimum. If a difference of brightness becomes large, it is not recognized as a peak and a peak detection is repeated. A gain value of the amplifier is reduced corresponding to a linear-, step- or curve characteristicline between a focus position of the focus lens and a focus distance of the zooming lens when a gain value of the automatic gain control (AGC) circuit is relatively high, so that a noise component in a high frequency part is reduced.

Abstract: Disclosed herein is an automatic focusing device high in focusing accuracy, in which an amount of drive for driving a focusing lens to a position focused on an object can be renewed during the focusing lens moving to the focused position. Further, the automatic focusing device is provided with a speed changing means capable of changing the movement speed of the focusing lens according to an amount of drive to the focused position.

Abstract: An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus information detected by analyzing a light that passes through a photographic lens. In case a focal length of the photographic lens moves out of a range wherein the set image magnification can be obtained, various options, such as a shutter-release lock operation, can be executed depending upon the chosen design of the camera.

Abstract: An autofocusing system for a camera, wherein a defocus amount is detected with a light-amount-integration type detector for performing a focusing operation. The focusing operation is adjusted in a predetermined fashion if it is determined that a photographic lens has moved and/or the focal length of the photographic lens has varied while the light-amount-integration is being executed.

Abstract: A filtering device for carrying out a filtering process in a space domain of image data derived from an external visual image input means and then delivering control information to a controlled driving device with the filtering device containing fundamental operator generation device for generating fundamental operators within the same fundamental operator series, and a filtering processing device for carrying out a convolution of a fundamental operator with an image data array and conducting a sequential series of such convolutions with varying input data based upon data detected at the output of the filter processing, so that the sequential convolution attains an effect equivalent to that attained by the direct convolution of the initial image data array with an expanded operator.

Abstract: An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus information detected by analyzing a light that passes through a photographic lens. In case a focal length of the photographic lens moves out of a range wherein the set image magnification can be obtained, various options, such as a shutter-release lock operation, can be executed depending upon the chosen design of the camera.

Abstract: An autofocusing system for a camera having a photographic lens including a focusing lens group and a zooming lens group, and a focus-lock means for inhibiting the driving of the focusing lens group once the photographic lens is brought into an in-focus condition. However, when the zooming lens group is thereafter driven, a re-focusing operation, or focus-correction operation, is executed.

Abstract: An autofocus system for a single-lens-reflex camera system, in which an autofocus operation is executed in cooperation with a camera body and a lens unit mounted to the camera body. The amount of cooperation between the lens unit and camera body is determined by the camera body, and depends upon the performance of the lens unit mounted thereto. Where the lens unit is equipped with a computing means and a lens drive means, the camera body merely detects a defocus amount and sends it to the lens unit so that a focusing operation can be executed by the lens unit itself.