Abstract: A printed circuit board (11) is provided with a conductive pattern (P, R) and a through hole (H) thereon. Respective images of the conductive pattern and a through hole are photoelectrically read with an image reader (20). The conductive pattern image is magnified in size to obtain a magnified pattern image (PI.sub.m), while the hole image is magnified at different magnification factors to obtain magnified hole images (HI.sub.n, HI.sub.n-i). A ring image (RP) is defined by the difference of the magnified hole images. The overlapped region (WR) on which the ring image and the magnified pattern image overlap each other is then calculated, and a defect or an opening of the conductive pattern is detected by calculating the aperture angle (.theta.) of the overlapped image.

Abstract: Disclosed is a ceramic composite consisting essentially of hexagonal boron nitride (h-BN), aluminum nitride and, if any, unavoidably formed aluminum oxynitride (AlON), and a sintering aid and/or a reaction product of the sintering aid with the above-mentioned components (h-BN, AlN and AlON), in which the total amount of the sintering aid and the reaction product is 0.01 to 5 parts by weight per 100 parts by weight of the sum of h-BN, AlN and AlON. This sintered body comprises AlN and AlON in a total amount of 45 to 5% by weight with 55 to 95% by weight of h-BN. Alternatively, this sintered body comprises AlN and AlON in a total amount of 80 to 5% by weight with 20 to 95% by weight of h-BN, the degree of anisotropy of the thermal conductivity of the sintered body (the ratio of the maximum thermal conductivity to the minimum thermal conductivity, the direction of the maximum thermal conductivity being perpendicular to the direction of the minimum thermal conductivity) being at least 2.

Abstract: A tape loading mechanism for use in a magnetic recording and reproducing apparatus including a rotary head comprises: a transmission gear assembly engaging a drive gear rotated by a loading motor; loading gears located at opposite sides of the rotary head one of which is directly connected to the transmission gear assembly whereas the other is connected same via a connection gear assembly; a pair of loading arms responsive to the loading gears to move a pair of loading blocks back and forth; and a pinch roller arm connected to one of the transmission gear assembly, loading gears and connection gear assembly to move a pinch roller back and forth.

Abstract: A dustproof door mechanism includes a dustproof door pivotably supported by a shaft and normally biased by a spring to its closed position, a door opening cam integrally formed with a loading gear rotatable in opposite directions to drive a cassette loading mechanism, and a door opening link engaging the dustproof door and pivoted by the door opening cam in a direction for opening the door.

Abstract: A pinch roller driving mechanism used in a magnetic recording and reproducing apparatus including a rotary head comprises: a pinch roller arm driving member provided on a pinch roller pull-out gear to rotate in the same direction as the gear; a pivotable pinch roller arm connected to the pinch roller arm driving member; and a pinch roller link having one end pivotably linked to one end of the pinch roller arm and the other end pivotably linked to a pinch roller block which supports a pinch roller and moves along a guide groove to bring the pinch roller into close contact with a capstan shaft.

Abstract: An R-DAT cassette loading mechanism comprises a reversible motor; a rotary member drivingly connected to the motor and having a driving pin formed at a central position of its lateral surface; a loading plate having first and second cam portions and pulled by the driving pin to reciprocally slide on a straight line; a guide link pivotably supported on a fixed member and rotated vertically by the first cam portion; a cassette holder pivotably supported on a free end portion of the guide link; a cassette guide having a contact portion accepting a front end portion of a cassette and slidably movable between a cassette sucking position and a cassette ejecting position; and a loading link pivotably supported on a fixed member and rotated on a horizontal plane by the second cam portion to slidably move the cassette guide.

Abstract: A pinch roller driving mechanism includes a second cam gear linked with a first cam gear which drives a loading block, and a pinch roller is driven by a pinch roller driving arm engaged with a grooved cam of the second cam gear.Owing to this construction, the timing of movement of the pinch roller can be deviated from that of the loading block, so that the path of movement of the pinch roller can be superposed on the path of movement of the loading blocks, what can make the construction smaller.

Abstract: An intermittent gear mechanism includes two intermittent gears mounted at opposite sides of a driving gear driven by a motor. One of the intermittent gears is normally held by a holding member at a position disengaged from the driving gear while the other intermittent gear engages the driving gear. When the latter intermittent gear is driven, the former intermittent gear is brought into engagement with the driving gear by a simple initial driving assembly.

Abstract: A mode switching over gear mechanism for reel according to this invention is characterized in that a reel brake is disposed at the outside of the fast forward gear and the rewinding gear, respectively; a preload brake is disposed at the inside of the fast forward gear and the rewinding gear, respectively; and the control of the preload brake is effected by the same member as the control of the take-up gear effecting the mode switching over at the play, which member is different from the member for the control of the reel brake.Owing to this construction, since the preload brake is released at the same time as the mode switching over by the engagement of the take-up gear, no infructuous load is applied thereto.

Abstract: A shift lever device with a shift lever movable in a shift direction and a select direction for operating a transmission. The movement of the shift lever is imparted through a flexible long means to the transmission.

Abstract: A cross arm mechanism in a pushbutton tuner in which a setting plate is pivotally mounted on a cross arm, a plate spring with a support point nearer to the proximal end of the cross arm than the rotation center of the setting plate is mounted on the cross arm, the plate spring has a substantially C-shaped tightening portion which is opened toward the front end of the cross arm to press the setting plate from outside and fix it unmoved, right and left lever portions extend from both ends of the C-shaped tightening portion toward the proximal end of the cross arm, and a means for opening and closing the distance between the levers is provided at the tips of the levers.

Abstract: In a guide shaft perpendicularly secured on a member with the base end thereof by caulking and serving with the outer peripheral surface thereof as a guide portion, a guide shaft characterized in that there is formed a step portion having a diameter smaller than that of the other portion thereof at the corner where the top end surface and the outer peripheral surface of the shaft intersect with each other.

Abstract: An indicator mechanism in a pushbutton tuner characterized in that there is provided a front plate horizontally extending from the top end of the tuner casing. The front plate is integrally formed with two-stepped protrusions, the lower one of which is inserted in a central bore of a slidable plate mounted on the front plate so that the slidable plate can pivot about the lower protrusion as an axis. The indicator mechanism further comprising a plate spring having an open rectangular configuration for seizing the front plate between its upper and lower plates. The plate spring is also formed with a through bore in its upper plate for receiving the upper protrusion of the front plate. The front plate is further formed with projections as high as the lower protrusion by which the upper plate of the plate spring is supported.

Abstract: A flat pushbutton tuner wherein button slide assemblies provided with pushbuttons are disposed in parallel with a base plate of the tuner and mounted directly on said plate without providing a housing or base for the button slide assemblies. The base plate is provided with horizontally extending seats and vertically extending seats formed integrally with said base plate for mounting components of the tuner thereon.

Abstract: A pushbutton tuner suitable for its thinner formation wherein a memory slide member is provided on a base plate of a tuner housing which is shiftable in a direction perpendicular to the sliding direction of a button slide, a gear mechanism is disposed for conjoint rotation with the associated memory slide member, said gear mechanism being connected to the base plate and a subframe attached to said base plate, and a worm wheel for transmitting the rotation to said gear mechanism through frictional members is so supported on said subframe that it may move in the direction of supporting said gear mechanism.

Abstract: A pushbutton tuner wherein a plurality of tilting actuating links are provided for a slide member for causing cores to move in-and-out of coils and the actuating links are adapted to engage setting pins of frequency regulating members respectively, which are provided on button slides actuatable by push buttons, respectively to effect a selection operation, which tuner is characterized in that a pivotal pin fitted in a hole formed in each of the frequency regulating members has a tapering portion and each of the setting pins also has a tapering portion at a portion where the setting pin engages the actuating link associated therewith.

Abstract: A pushbutton tuner with its reduced size includes linkage means operatively connected a tuning slider laterally positionable in accordance with the setting of the tuner. A link engaging pin provided on a pushbutton operative member engages with the linkage means upon depression of the pushbutton operative member so as thereby to move the slider depending upon the preset position of the engaging pin.

Abstract: A pushbutton tuner includes unique linkage means operatively connecting a tuning slider laterally positionable in accordance with the setting of the tuner. A link engaging pin provided on a pushbutton operative member engages with the linkage means upon depression of the pushbutton operative member so as thereby to move the slider depending upon the preset position of the engaging pin.