摘要:
A reflecting mirror and an optical bench are placed on an external jig provided with a mirror holding portion for maintaining the reflecting mirror, and then the reflecting mirror and the optical bench are bonded and fixed, thus obtaining an optical head. An adhesion reference plane for the reflecting mirror is no longer required in the optical bench, thus reducing the size and cost of the optical bench. The mounting precision is high and stable. Further, the reflecting mirror is bonded and fixed at the vicinities of the approximate centers of its two opposed side faces and therefore the variation in orientation of the reflecting mirror due to expansion or contraction of an adhesive is lessened, thus achieving a highly-reliable optical head excellent in environmental stability characteristics.
摘要:
An optical head includes the following: a light beam separator (35) that includes substantial interference regions for light that is reflected from an information recording medium and travels in a straight path and ±first-order diffracted light produced by information tracks of the information recording medium, and diffracts each of plural light beams in regions (32a, 32b) of the substantial interference regions, where the amount of light is changed by a change in the relative angle between the information recording medium and the objective lens and by a shift of the objective lens in the radial direction of the information recording medium; a light-receiving element (36a, 36b) for receiving the light beam that is reflected by the information recording medium and separated by the light beam separator (35); and an arithmetic circuit that corrects a value of an electrical signal detected by the light-receiving element (36a, 36b) in accordance with a radial position signal corresponding to the amount of shift of the objective lens in the radial direction of the information recording medium, and detects the relative angle between the information recoding medium and the objective lens.
摘要:
A reflecting mirror and an optical bench are placed on an external jig provided with a mirror holding portion for maintaining the reflecting mirror, and then the reflecting mirror and the optical bench are bonded and fixed, thus obtaining an optical head. An adhesion reference plane for the reflecting mirror is no longer required in the optical bench, thus reducing the size and cost of the optical bench. The mounting precision is high and stable. Further, the reflecting mirror is bonded and fixed at the vicinities of the approximate centers of its two opposed side faces and therefore the variation in orientation of the reflecting mirror due to expansion or contraction of an adhesive is lessened, thus achieving a highly-reliable optical head excellent in environmental stability characteristics.
摘要:
A motor generator is provided with a stator having a winding around each of a plurality of stator teeth, and a rotor having a plurality of permanent magnets by the number larger than that of the stator teeth, arranged in the circumferential direction at equal intervals. The stator teeth are formed of a first stator teeth section including a plurality of stator teeth groups I, II, and III each including the adjacent stator teeth around which a winding to which the same phase voltage is applied is wound and in which winding directions of the stator teeth are opposite to each other, and a second stator teeth section including a stator teeth having a winding wound therearound and being placed among stator teeth groups of different phases such that electric power is independently input and output with respect to the first and second winding sections. This makes it possible to reduce the space and the cost while inputting/outputting the electric power through different channels and allowing arbitrary design of the electric power distribution.
摘要:
An optical head including a light source for emitting luminous energy recordable on a recording medium, a heat radiating section, in contact with the light source, for radiating heat which accompanies the light emission thereof, and a resin-made bench for mounting and fixing the aforementioned elements, or an optical head having a light source for generating luminous energy required for recording on a disk-shaped information recording medium or reproducing information recorded on the disk-shaped information recording medium; a radiator plate, in contact with the light source either directly or indirectly, for guiding heat which accompanies the emission of light by the light source; an objective lens for focusing light on the disk-shaped information recording medium; an objective lens drive unit for driving the objective lens in the focal and radial direction of the medium; a light receiving element for receiving light reflected from the medium; a sheet-shaped flexible circuit for feeding power to the light source and the light receiving element and communicating signals from the light receiving element; and an optical bench holding at least the light source, the objective lens drive unit, the radiator plate and the light receiving element, in which the radiator plate is brought into contact with a heat transfer section provided in the flexible circuit and, by causing the flexible circuit to guide heat from the radiator plate, heat generated by the light source is radiated through the flexible circuit and the radiator plate.
摘要:
The present invention provides a cleaning disk and a magneto-optical disk drive apparatus being simple in structure, adaptable to cleaning disks having various specifications, low in power consumption, low in electromagnetic noise, and preventing damage to the magnetic head and the optical head; the cleaning disk comprises a magneto-optical disk having an information layer, and a head-cleaning member, provided on the magneto-optical disk, for cleaning the magnetic head of the magneto-optical disk drive apparatus, wherein information regarding a magnetic head cleaning condition for setting the operation condition of the magneto-optical disk drive apparatus during cleaning of the magnetic head has been recorded in advance on the information layer of the magneto-optical disk. The magneto-optical disk drive apparatus reads the information regarding the magnetic head cleaning condition so as to set the operation condition properly.
摘要:
In a brushless motor driving circuit of the invention, in the starting operation, an applying voltage is low and also the induced voltage is low, so that output values from sample and hold circuits 6 and 7 are substantially equal to each other. Thus, an output from a comparing circuit 10 is substantially equal to an output of a V/f converting circuit 11. As a result, the starting method which is identical with a conventional method is used. By contrast, when the number of rotation of a brushless motor 1 is increased, and the induced voltage is started to be observed, the condition is spontaneously shifted to that in which the driving voltage is automatically controlled at each time to an appropriate value for the number of rotation and the load of the motor. Accordingly, the switching operation from the starting control to the normal control is not required.
摘要:
A merchandise analysis system for predicting the sale of a registered item, including: a sales data table having sales data of a plurality of items; an input terminal for registering an item and for setting an analysis term; a retrieval unit connected to the table and the input terminal to search the sales data table for the sales data corresponding to the registered item and the analysis term; a function table having various functions fitted to respective data of sale versus price; a dispersion measure table for storing errors obtained with respect to the respective data of sale versus price retrieved on the basis of the respective functions; an analysis device connected to the dispersion measure table so as to determine one function giving the minimum one of the errors and the values of parameters therefor; and a display connected to the dispersion measure table so as to display the sales data of the registered item corresponding to the analysis term in a graph expressing the determined one function into which the determined parameters are substituted, the display being arranged to display the predicted sale corresponding to the registered price inputted through the input terminal in accordance with the display of the sales data.