Ricoh Company, Ltd.

Tokio Ishino

Yoshimi Ohno

Ikuya Tsurukawa

Akira Ueno

Atsushi Sato

Saburo Sasaki

Hiroshi Terui

Motokuni Demura

A photographing optical system in a varifocal lens is constructed by only a main lens at a wide angle time and a sublens moved backward from the main lens at a telescopic time. A wide angle pattern for prescribing a focusing region at the wide angle time is proximately disposed backward from a focusing starting position at the wide angle time. A telescopic pattern for prescribing a focusing region at the telescopic time is proximately disposed forward from a focusing starting position at the telescopic time. A sliding brush 16 is disposed in a front group frame for holding the main lens and is slidably moved on the wide angle and telescopic patterns to detect the respective focusing regions of the main lens at focal lengths and the focusing starting positions. A focusing position of the lens system is detected by a digital signal generator composed of a rotary encoder rotated in association with the operation of a drive motor.

Varifocal lens

A camera comprises a camera body which is integrally formed with a lens barrel containing a lens having an optical axis. A receiving chamber for receiving an elongated electronic flash body is formed along the lateral side of the lens barrel in parallel to the optical axis of the lens. The electronic flash body having top and bottom ends is provided at its one side with a light emitting window located near the top end thereof. The flash body is built into the camera body through a pop-up means so as to be moved between a first position at which substantially the overall length of the flash body is received into the receiving chamber in the state that the light emitting window is oriented downward and that the bottom end of the flash body is located in the rear end portion of the receiving chamber, and a second position at which the flash body is raised upward from the camera body in the state that the light emitting window is oriented forward and that the bottom end of the flash body is located in the front end portion of the receiving chamber.

Camera with built-in electronic flash

A quick mirror return mechanism includes a return spring and a quick return setting member, which are formed, in the region where they abut against each other, so that as the return spring is stressed, the resilient force of the return spring is directed closer to the direction in which a setting pawl moves. A main mirror for a finder, a stationary member, a mirror-up lever, a main mirror drive, a sub-mirror and a sub-mirror driver form together a six-bar linkage wherein the main mirror moves upward while swinging back and the sub-mirror moves into overlapping relationship with the main mirror when the latter has completed its upward movement. The quick return mechanism which is biased with an increased force is disposed on a front panel of a camera, thus preventing any excessive force from being applied to a mirror box. A light receiving element unit is disposed in the bottom of the mirror box. A light receiving element unit is disposed in the bottom of the mirror box, and is arranged on a substrate, tilting of which can be separately adjusted in the fore-and-aft and lateral or left-and-right direction by adjusting the angular positions of a first and a second lever.

Single lens reflex camera

Growing community of inventors

Kawasaki, Japan

Tokio Ishino