Abstract: In a camera having a camera body unit constituted by combining a plurality of units, the camera configuration is realized so as to allow to easily remove only a lens frame unit from the camera body unit before the other units (for example, a strobe unit, a finder unit, a film feed unit and the like) when the camera is disassembled to repair or replace the lens frame unit by constituting so that the lens frame unit having a photographing optical system can be mounted independently.

Abstract: A drive unit for an optical memory device includes a casing having an insertion slot which is formed in a front section and through which a medium cartridge is inserted into an interior of the casing. A front cover member movably covers the insertion slot of the casing, and includes first and second covers which are rotatable around respective first and second rotation shafts. The first front cover has a distal end which is situated on an outer side of the casing when the insertion slot is closed, the second front cover has a distal end which is situated on an inner side of the casing when the insertion slot is closed, and the second front cover is rotated with a radius of rotation which differs from that of said first front cover.

Abstract: An automatic chemical analyzer includes a rotary disc which is intermittently driven for rotation in a given direction and which is provided with a plurality of holders, each of which receives a reaction tube therein. The reaction tubes are disposed to move through an annular channel of a thermostat liquid vessel which maintains first reagent and a liquid sample to be examined, both injected into a reaction tube, at a given temperature. Second reagent is heated to a predetermined temperature before it is injected into the reaction tube. After the injection, the liquids are agitated to mix them together, and the resulting reaction solution is then subject to a colorimetric determination by an optical measuring instrument. Subsequently, the reaction solution is discarded, and rinse water which is previously heated to a given temperature is supplied to the tube for cleaning it.