Abstract: A push button switch with a simultaneous locking preventing function which can attain its miniaturization while realizing a sure single action. The switch includes a core mounted for sliding movement in each of a pair of sliders mounted for up and down movement in a casing. A heart-shaped cam groove having a plurality of regions of varying height is formed either on an end face of each core or with the locking region of the cam groove formed on an end face of each core and with the remaining regions formed on a contiguous wall face of the corresponding slider. An actuator pin is provided for each slider and traces the cam groove to lock the slider at its depressed position when the slider is depressed. When the sliders are depressed simultaneously, a simultaneous locking preventing member prevents the sliders from being locked at the depressed positions.

Abstract: A liquid crystal compound comprising the following general formula (1): ##STR1## where i, j and k individually represent an integer within a range : 1.ltoreq.i.ltoreq.8, 0.ltoreq.j.ltoreq.7, 4.ltoreq.k.ltoreq.14, Ar.sub.1 represents ##STR2## (S=1 or 2), Ar.sub.2 represents ##STR3##*represents an asymmetric carbon and the compound is required to be optically active. The compound can provide various merits as the chiral substance such as satisfactory optical rotation, capability of inducing twisted arrangement when added to the TN system or phase transition system liquid crystal mixture, and of enlarging the liquid crystal temperature range when added to SmC* liquid crystal mixture.

Abstract: A thermal head includes an overcoat layer made from SIALON mixed with tungsten.

Abstract: A liquid crystal composition includes at least one of specific pyrimidine compounds, and may be used to form a strong dielectric liquid crystal display element.

Abstract: Disclosed is a coordinate input device which, in a device including first collecting electrodes disposed at both edges of a first resistive film and parallel to each other and second collecting electrodes disposed at both edges of a second resistive film and parallel to each other, the first and second resistive films being disposed opposite to each other with the first and second collecting electrodes meeting at right angles to each other, and further including plural auxiliary electrodes disposed on the first and second resistive film and parallel to the respective first and second collecting electrodes, is adapted such that an unusable region is provided between the first or second collecting electrode and the respective auxiliary electrode disposed adjacent thereto.

Abstract: A pair of substrates are opposed to each other and the peripheral portions thereof are sealed by a sealing member. A part of the sealing member is opened so as to constitute a liquid crystal injection hole. A groove for introducing a liquid crystal is provided on the inner surface of at least one of the substrates in such a manner as to lead from the injection hole to the inner surface of the cell.

Abstract: An apparatus for measuring the floating amount of the magnetic head comprising a single color light source such as laser, a rotating glass disk, a light scanner section, a photoelectric converter element, and an interference light strength computing section (or waveform memory section and computer section). Therefore, static behaviors such as pitch angle and balance of the magnetic head can be measured along with dynamic behaviors such as floating and frequency fluctuations thereof. Even when the floating amount of the magnetic head is extremely low, the measurement can be made accurately in a shorter time period with a high S/N ratio.

Abstract: A liquid crystalline compound represented by the following general formula: ##STR1## where m and l represent individually integers within a range: 6.ltoreq.m.ltoreq.14 and 1.ltoreq.l.ltoreq.5, the symbol * represents an asymmetric carbon atom and the compound is required to be optically active. The compound can induce the twisting arrangement when added to the TN system or phase transition type liquid crystal mixture, as well as can improve the spontaneous polarization as the index of the ferroelectric property when added to the SmC* liquid crystal mixture.

Abstract: An optical coordinate system input device includes a plurality of light emitting elements aligned in X and Y directions and sequentially, selectively supplied with a drive current, and a plurality of light receptor elements opposed to the respective light emitting elements each receiving a light signal from opposed one of the light emitting elements. The device specifically includes an adjusting circuit to adjust the value of the drive current flowing in the light emitting elements.

Abstract: Disclosed is here a rotary encoder having a recording medium including positional information arranged in a circumferential direction, sensors disposed opposing the positional information, and a driving shaft linked with a central position of the recording medium for detecting, based on a change in outputs from the sensors, the positional information of the recording medium rotated by means of the driving shaft. A link body is formed by achieving a bending work on an elastic plate such that bent lines of the elastic plate form a rectangular shape and that there are formed two pairs of opposing bent leg pieces, one of the two pairs of the opposing bent leg pieces is fixedly secured on the recording medium and the other one thereof is fixedly secured on a coupling body disposed in the proximity of the recording medium, and the driving shaft is inserted into and fixed on a shaft inserting hole formed in the coupling body.

Abstract: An optical position input device wherein an influence of disturbant light can be practically eliminated. The device includes a large number of light emitting elements and a large number of light receiving elements arranged in an opposing relationship along two sides and the other two sides, respectively, of directions of the X- and Y-axes. During driving scanning of the light emitting elements and the light receiving elements in the direction of the X-axis, a light reception signal developed in response to incident disturbant light from a selected one of the light receiving elements in the direction of the Y-axis is stored into a memory, and then the light reception signal is subsequently read out from the memory and is subtracted on a subtractor from a light reception signal developed from a light receiving element selected upon driving scanning for the direction of the Y-axis. The subtractor thus provides a position signal from which an influence of disturbant light has been eliminated assuredly.

Abstract: An image scanner, in one of a system in which reading of data is performed by shifting a case with an image sensor incorporated therein relative to the surface of a fixed original, is disclosed comprising a window provided on the case for enabling the operator to make visual observation of data being read. The window is provided put therein with a member of frosted glass or the like capable of forming an image thereon, whereby the image of the data being read is adapted to be formed on this member.