Abstract: A zoom lens-barrel assembly includes a differential cam frame which is moved in an axial direction together with a movable barrel and is rotated around an optical axis. Lens holding frames are cam-linked with the differential cam frame. The positions of the lens holding frames relative to the cam frame are changed by the rotation of the cam frame.

Abstract: A camera includes a photographic optical system movable along its optical axis, and a cam ring rotatable about the optical axis of the optical system. When it is rotated by a motor, the cam ring moves the optical system to change the focal length thereof. Arranged at the outside of the cam ring are a viewfinder optical system, whose optical axis is parallel to that of the photographic optical system, and a strobe mechanism movable in a direction parallel to the optical axis of the photographic optical system. First and second cam portions are arranged on the cam ring and engage the viewfinder optical system and strobe mechanism, respectively, so as to move them along the optical axis of the photographic optical system, in association with the rotation of the cam ring.

Abstract: A data recording camera capable of recording a shooting date includes a memory for storing data as to the current date, a memory for storing data as to the birth date of an individual, an operation circuit for obtaining the age of the individual based on the data as to the current date and the birth date stored in the memories, and a display member for optically displaying the obtained age which is also photographically recorded on a film.

Abstract: A camera with a built-in zoom lens includes at least first and second lens groups, a zoom frame for moving these lens groups along their optical axis during a zooming operation, a first lens holding frame carrying the first lens group and movable together with the zoom frame, a second lens holding frame carrying the second lens group and movable together with the zoom frame, a rocking arm disposed between the zoom frame and the second lens holding frame, rockingly supported on a camera body and having a first abutment which bears against the zoom frame and a second abutment which bears against the second lens holding frame, and a resilient biasing element for urging the second lens holding frame towards the zoom frame side; in addition to the above biasing element is a lock member for locking the second lens holding frame during a macro operation.

Abstract: Provided is a process for preparing a diaryl or a mixture of diaryls represented by any or a combination of the following formulae (II), (III) and (V), characterized in that a diaryliodonium salt represented by the following formula (I) is reacted in a solvent in the presence of a transition metal catalyst and a reducing metal at a temperature in the range of room temperature to 100.degree. C.:[Ar.sub.1 -I.sup..sym. -Ar.sub.2 ]X.sup..crclbar. (I)Ar.sub.1 -Ar.sub.1 (II)Ar.sub.1 -Ar.sub.2 (III)Ar.sub.2 -Ar.sub.2 (IV)wherein Ar.sub.1 and Ar.sub.2, which may be alike or different, are each an aryl group which may have a substituent group or groups and X.sup..crclbar. is a counter ion which is inert to said reaction.

Abstract: Provided is a process for preparing an aldehyde or aldehydes represented by the following formula (III), characterized in that a diaryliodonium salt represented by the following formula (I) is reacted with an unsaturated alcohol represented by the following formula (II) in a solvent containing a base in the presence of a transition metal catalyst at a temperature in the range of room temperature to 100.degree. C.:[Ar.sub.1 --I.sup..sym. --Ar.sub.2 ] X.sup..crclbar. (I)CHR.sub.1 .dbd.CR.sub.2 --CH.sub.2 OH (II)Ar.sub.3 --CHR.sub.1 --CHR.sub.2 --CHO (III)wherein Ar.sub.1 and Ar.sub.2, which may be alike or different, are each an aryl group which may have a substituent group or groups, X.sup..crclbar. is a counter ion which is inert to the above reaction, Ar.sub.3 is the same aryl group as Ar.sub.1 or Ar.sub.2, and R.sub.1 and R.sub.2 are each hydrogen atom or an alkyl group of C.sub.1 to C.sub.12.

Abstract: An envelope of an electronic clinical thermometer has an inner wall on which is mounted a vibrating element adapted to produce an audible tone. The portion of the envelope at which the vibrating element is provided is formed to include a portion that vibrates together with the vibrating element, when the latter is set into operation. The mounting arrangement for the vibrating element is defined in part by a recess formed in the inner wall of the envelope.

Abstract: A light measuring device for a single lens reflex camera includes a principal or main mirror capable of dividing light passing through an objective lens towards a finder system and towards a film plane. A submirror is provided behind the main mirror and directs the light passed therethrough towards the film plane for ultimately determining a focusing condition and a measurement of light intensity. A pair of focus detecting photosensor arrays, as well as a spotlight measuring photocell, is arranged relative to the submirror to receive the object light. The auxiliary mirror can be formed with a center portion for reflecting the light through the photocell arrays and a second light-reflecting plane having light diffusive characteristics for directing light for the detection of light measurement.

Abstract: Provided is a process for converting an aromatic compound to prepare an iodoarene, Ar--I, and an aryl compound which is a compound wherein an unsaturated compound is bonded directly to an aryl group, Ar, which process comprises reacting a diaryliodonium salt represented by general formula (I)[Ar--I.sup..sym. --Ar]X.sup..crclbar. (I)wherein Ar is an aryl group which may be substituted and two Ar's are identical and X.sup..crclbar. is a counter ion inert to the reaction with the unsaturated compound in a solvent in the presence of a transition metal catalyst and a base or a reducing metal, said reaction being carried out at a temperature not higher than 80.degree. C. and/or by using at least one of the base, the reducing metal and the unsaturated compound in an amount not more than 1.

Abstract: An optical system for a viewfinder camera is provided. The objective lens system is divided into at least two separate lens groups. The first lens group provides an insufficient correction to aberration while the second lens group is designed specifically to correct the aberration transmitted through the first lens group. The complimentary viewfinder system is also likewise designed to correct the same aberration as the second lens group.

Abstract: A pentagonal prism for use in a viewfinder of a single lens reflex camera is made of a glass whose refractive index and Abbe number are not less than 1.6 and 45, respectively. Effective optical path regions on a pair of roof surfaces of the prism are left transparent so that viewfinder light can be totally reflected at both of the roof surfaces. A light absorbing paint is coated in an upper front surface, a pair of said surfaces of the prism as well as at regions other than effective optical path region of the roof surfaces, a bottom light incident surface and a rear light exit surface of the prism. The light absorbing paint prevents the occurrence of ghost images in the view field of the viewfinder. New type glasses suited for the prism are proposed.

Abstract: An optical conversion attachment assembly for objective camera lenses is provided to convert a lens into a monocular optical device. A camera exchangeable lens can be detachably mounted on the barrel of an optical attachment having an erecting prism and an ocular system to vary the diopter power. The optical attachment further provides a device for automatically contacting and holding the diaphragm of the camera exchange lens at a maximum aperture opening.

Abstract: A hollow pentagonal roof type reflecting mirror assembly for use in a viewfinder optical system of a single lens reflex camera is dust tight to prevent entry of dust into the inside hollow space and includes a filtered vent aperture to allow passage of vapor so that condensation will not occur inside the assembly. The assembly includes a hollow pentagonal body having roof and front mirrors and at least one vent aperture and a shielding or sealing member arranged to close the vent hole. The shielding or sealing member is made of a dust proof and ventilative material such as a foamed plastic, a paper and a cloth to filter out any dust particles.

Abstract: A pentagonal prism for use in a viewfinder of a single lens reflex camera makes use of total reflection of viewfinder light flux at effective optical path regions on its pair of roof surfaces. The prism constitutes a module together with a protection cover attachable thereto for protection of the roof surfaces. The cover is provided with a pair of roof walls accomodated to the roof surfaces of the prism and including recessed portions corresponding to the effective optical path regions on the roof surfaces and peripheral portions corresponding to portions on the roof walls out of the effective optical path regions. Upon attachment of the cover to the prism, the peripheral portions contact the portions on the roof surfaces out of the effective optical path regions and an air space which ensures the total reflection is left between the inner surfaces of the recessed portions and the effective optical path regions on the roof surfaces.

Abstract: An indicating device for a camera, which includes a viewfinder and which is selectively settable to either an automatic diaphragm control mode or an automatic shutter speed control mode, enables selective observation of the f-number and the shutter speed scales in accordance with the selection of the exposure control modes. The f-number and shutter speed scales are provided on a common transparent scale plate which is interconnected with an exposure control mode selecting member by a scale shifting mechanism. The scale shifting mechanism shifts the scale plate to a first position wherein only the f-number scale is in the viewfinder optical path upon selection of the automatic diaphragm control mode, and to a second position wherein both the f-number scale and the shutter speed scale are in the viewfinder optical path. A scale shielding member is provided within the viewfinder optical path to shield the f-number scale when the scale plate is in the second position.

Abstract: A pentagonal roof reflecting viewfinder assembly for a single lens reflex camera is provided. A focussing plate and a first and second reflecting mirror are part of the assembly. The improvement includes a third aspherical reflecting mirror having a lesser curvature at its marginal portions than adjacent an apex of the surface. The apex being positioned above the reflective surface of the third mirror. An ocular is provided having at least two lens elements with one of the lens elements being tilted relative to the optical axis of the ocular.

Abstract: A viewfinder for a single lens reflex camera of the T.T.L. light measurement type, wherein light measurement is apt to be affected by external light entering through an eyepiece, includes a diopter adjusting mechanism and an eyepiece shutter. The eyepiece is divided into at least a movable first optical element and a fixed second optical element. The diopter adjusting mechanism is capable of shifting the first optical element for diopter adjustment within a predetermined space which extends along the viewfinder optical axis and is at least partially common to a space that the eyepiece shutter occupies at an advanced position for blocking the viewfinder optical path. Operation of a manually operable member for shifting the eyepiece shutter toward the advanced positon causes the first optical element to be retracted toward the rear away from the predetermined space prior to the shift of the eyepiece shutter into the advanced position.

Abstract: A compact camera contains a plurality of objective lenses which are selectively alternatively advanced by external manipulation into registry with the camera photographing optical axis to vary the image magnification. A view finder optical system is provided which includes a lens member which is movable into and out of registry with the view finder optical system to vary the viewer field to correspond to the field of the operative objective lens. A lens storage space is provided between the laterally spaced view finder and photographing optical axis, one of the objective lenses when retracted occupies the storage space and when this lens is advanced to the photographic optical axis it may be replaced in the storage space by the retracted view finder lens member.

Abstract: A large number of cones such as circular cones or pyramids, or conical recesses are regularly uniformly distributed and formed on a surface of a transparent focussing plate. Each cone or conical recess has a large number of fine irregularities on the sloping surface thereof to thereby diffuse the light passing through the sloping surface.

Abstract: Here is disclosed a packing case assembly of a set of decoration lamps including a group of lamps and electric cord connecting the lamps to a plug with the group of lamps being placed at the top and the electric cord being folded in a zig-zag manner and bundled together. The assembly comprises a case and a cap. The case includes a container substantially of a cup-shape to encase the bundled cord and an enlarged portion having an outer diameter larger than the outer diameter of the container and formed integrally with the container to receive the lamps. The cap is removably fixed to the case to cover the lamps. The assembly is compact, and is easy to handle and transport.