Canon Kabushiki Kaisha

Akio Sunouchi

Yoshiaki Watanabe

Masahisa Fujino

Ryuji Suzuki

Susumu Kozuki

Toshikazu Ichiyanagi

Tatsuo Konno

Fumio Ito

Nobuaki Date

Tadashi Ito

Takashi Uchiyama

Nobuyuki Suzuki

Yukio Mashimo

Yasuo Suda

Tomonori Iwashita

Kiyoshi Alyfuku

Nobuo Tezuka

Yukio Ogawa

Hidehiko Fukahori

Syuichiro Saito

Yoshitaka Murata

Masayuki A Suzuki

Ryoichi Suzuki

Masanori Uchidoi

Masami Shimizu

Masayoshi Yamamichi

Mutsuhide Matsuda

Nobuo Kikuchi

Yukio Iura

Ryuji Tokuda

Hiroyashu Murakami

Youichi Okuno

Kanehiro Sorimachi

Toyokazu Mizogui

Kenichi Kumazawa

Sakae Hokkanji

A shutter device for a still video camera comprises first and second shutter blades, a latch member and an unlatch member. The latch member latches the first blade at its moved position where an image pickup element is exposed to an image light. The first blade is kept latched for a preparatory exposure to correct a set exposure value on the basis of the output of the pickup element or for picking up a motion picture. The unlatch member releases the latching of the first blade. In one embodiment, the unlatch member is provided on the second blade to unlatch the first blade when the second blade is moved to terminate the exposure. In other embodiments, the unlatch member includes an electromagnet to unlatch the first blade. A still video camera comprises a view finder mirror and a mirror operating mechanism. The mechanism includes a motor and is arranged to retract and return the mirror relative to an optical path by utilizing a normal and a reverse rotation of the motor, respectively. In the disclosed embodiments, the camera further comprises a mechanism to maintain the mirror in the retracted condition and a shutter in the opened condition to operate in a motion video mode where an image pickup element is continuously exposed to an image light. The mechanism for setting in the motion video mode may be operable manually from the exterior of the camera or by connecting an external device to the camera.

Camera shutter and viewfinder control apparatus

Camera

The disclosed light measuring arrangement is positioned to receive and measure light from a focusing screen on which a display of focusing conditions is superimposed. A correcting circuit corrects the object brightness sensed by the light measuring arrangement. When display segments of the display are selectively switched on and off, the correcting circuit produces an output signal representing a corresponding brightness correction factor which is applied to the light measuring arrangement.

Light measuring device

The disclosed camera includes a view finder whose visual field displays a mark indicative of a focused condition. A display which extinguishes the mark either immediately after the detection of the in-focus condition or a predetermined time after the detection of the in-focus state condition, and generates an audible or visual mark outside the view finder's visual field.

In-focus state display device for camera

The disclosed light measurement compensation device for a camera includes the known resistors for aperture correction and for curvature correction in order to compensate for the error of light measurement in the full open aperture light measuring mode. The device also includes a resistor for compensating for the light measuring output difference present between two light measuring modes, or partial light measuring mode and average light measuring mode, and another resistor for shifting the light measuring output by a prescribed quantity. For this reason, even though the various light measuring modes, namely, full open aperture-average light measuring, stop down-partial light measuring, full open aperture-partial light measuring, and stop down-average light measuring modes, are selectively used, either an erroneous display or a drop of the exposure accuracy seldom takes place.

Light measurement compensation device for camera

A mechanically controlled shutter with a latch for holding the closing curtain in a charged position arranged upon running off of the opening curtain to start operation which then terminates at running off of the closing curtain to control the shutter time, wherein there is provided a keeper for holding the closing curtain latch in the charged position independently of the closing curtain latch, whereby after actuation of a camera release operation and before the opening curtain runs off, the keeper is actuated to release out of holding connection with the closing curtain.

Shutter control device for camera

A light shading device for a camera in which a soft and elastic light shading curtain has a base part which is fixed on a flat support surface, in the region of the shutter running path. The free end of the shading curtain is brought into elastic contact with the shutter curtain by way of a step provided on the support, the step serving to incline the free end of the light shading curtain with respect to the support surface.

Light shading device for a camera

The disclosed camera includes a viewfinder which displays a display member representing a preset aperture value in its view field, and is capable of operating in open aperture and stopped down aperture manual exposure modes as well as a shutter priority automatic exposure control mode. A retracting arrangement retracts the display member from the view field in response to a shift either to the stopped down or the shutter priority automatic exposure control mode.

Camera capable of switching between manual exposure control and shutter

The disclosed camera ordinarily uses an electromagnetic release device. A supplemental mechanical release device is enabled only when the electromagnetic release device's battery is absent from the battery case. The release operation is then carried out by the mechanical release device.

Camera and release device therefore

In the disclosed camera system, a spring arrangement to drive an automatic exposure mechanism of a camera and a magnet arrangement to control starting and stopping of the AE mechanism of the camera are provided within an electric drive device, and the automatic exposure control of the camera is carried out by mounting the electric drive device on the camera. Facilities, when energized by a power supply, are set to supply driving power to a motor for cocking the shutter, and an arrangement supplies power from the power source to the magnet arrangement for actuating the magnet arrangement. The present invention eliminates disadvantages of prior camera systems, namely, inferior response characteristic of the magnet and erroneous operations by the release action, and a large number of connecting terminals.

Camera system with camera mounted drive

A fixing member having a screw part to be attached to the cable release mounting screw hole of a release button of a camera and a cover member made of an elastic material are unified into one body and are arranged to be attachable to and detachable from the cable release mounting part of the release button.

Release operation device for camera

A device for releasing shutter hold particularly for a single lens reflex camera including a shutter hold release device having a release mechanism for releasing the shutter hold wherein the driving power for the release mechanism is charged into the release mechanism in operative engagement of the charge of mirror driving power in a mirror driving mechanism of the device.

Single lens reflex camera

A camera capable of changing over between electromagnetic release and mechanical release and to which a motor drive unit is attachable, whereby when in the mechanical release position the use of the motor drive unit permits an automatic winding operation to be initiated in response to return of the release button after the exposure has been completed.

A camera provided with a control member for changeover from the film winding to the film rewinding mode and an operating member for actuating the control member, wherein the operating member is made movable in a first direction followed by a second direction, whereby at the terminal end of movement of the operating member in the first direction, the operating member is rendered capable or actuating the changeover control member as it moves in the second direction.

Growing community of inventors

Tokyo, Japan

Akio Sunouchi