The present invention provides a process for the
production of a semiconductor device comprising a semiconductor
element provided on a printed circuit board with a plurality of
connecting electrode portions provided interposed therebetween,
the gap between said printed circuit board and said
semiconductor element being sealed with an underfill resin
layer. In accordance with the present invention, (1) the
underfill resin layer is formed by melting a lamellar solid
resin provided interposed between said printed circuit board
and said semiconductor element, and (2) the lamellar solid
resin provided interposed between said printed circuit board
and said semiconductor element is heated for a predetermined
period of time until the temperature of the solid resin layer
reaches a predetermined range where the two components are
connected to each other under pressure under the following
conditions (X) and (Y):
 (X) Supposing that the initial residual heat of reaction of
the solid resin before heating is 100% as determined by a
differential scanning calorimeter (DSC), the residual heat of
reaction thereof is not more than 70% of the initial residual
heat of reaction; and (Y) The temperature of the semiconductor element is
predetermined higher than that of the printed circuit board,
and the difference in temperature between them is not less than
50°C. In this manner, a production process which facilitates the
resin sealing of the gap between the semiconductor element and
the board and thus can inhibit warpage of the entire
semiconductor device and a semiconductor device having an
excellent reliability can be provided. In the present
invention, the use of a sheet-like underfill material which
gives an underfill resin layer having an elastic modulus in
tension at 25°C of from 300 to 15,000 MPa when hardened can
provide a semiconductor device which exerts an excellent effect
of relaxing the stress on the semiconductor element, printed
circuit board and connecting electrode portions and thus
exhibits a high reliability.

Manufacture of semiconductor device

A video tape recorder has a simple helical-scan construction capable of variable-speed reproduction free from noise bars on reproduced images at desired speeds ranging from a normal speed in reverse reproduction to threefold normal speed in forward reproduction. The video tape recorder comprises a magnetic tape drive mechanism including a capstan motor and a pinch roller for driving a magnetic tape, a control circuit for moving the magnetic tape at constant speeds including a normal speed, a twofold speed, a threefold speed in forward reproduction and a normal speed in reverse reproduction, and for keeping the magnetic tape stationary, a speed setting circuit for setting any one of the foregoing speeds as a tape running speed, a control signal reproducing circuit for reproducing control signals recorded on the magnetic tape at one-frame intervals, a control signal selection circuit for selecting a control signal dependent on a speed setting from the reproduced control signals, a time setting circuit for varying a time setting starting from a control signal selected by the control signal selection means, and a speed changing circuit for changing the normal speed in reverse reproduction, the stationary, the normal speed, the twofold normal speed, and the threefold normal speed in a time interval of a few frames.

Video tape recorder

A data transmission system operative to transmit data with a reduced low band frequency component includes facility for processing a predetermined quantity of information data, such as a code word, for generating error detecting-correcting data, and for dispersing the latter data in the former data. In one practice for effecting the dispersion, the system divides the information data and the error detecting-correcting data into respective groupings, and disperses the latter grouping into the former grouping. The resulting signal is transmitted.

Data transmission system

PURPOSE:To obtain a latent heat accumulation type electric heater used for a room heater or a heat insulator having high flexibility, high heat accumulation efficiency, light weight and reduced thickness by containing a flexible linear heater in a vessel for containing latent heat accumulation material formed of a flexible material. CONSTITUTION:Two polyethylene films are superposed, the ends of the films are thermally press-bonded to form a slender bag shape as a flexible flat vessel 2, a linear heater 1 is passed in the center of the vessel, one end 3 of the vessel 2 is thermally press-bonded to secure the heater 1. Then, a latent heat accumulation material 5 is filled from the other end 4 of the opened vessel 2. The material 5 contains aqueous salt of 3 sodium acetate which includes 1wt% of hydride salt of 10 overcool preventing agent of sodium pyrophosphate. After the material 5 is cooled and solidified, the top of the vessel 2 is thermally press-bonded and sealed to obtain an electric foot heater. It can be used as an electric vest or a cooking heat insulator by altering the shape of the vessel.

Heat accumulation type electric heater

PURPOSE:To control the spray time of liquid to the time which a customer prefers by providing an extension button which can additionally spray the liquid being sprayed at present and a termination button which can terminate the present spray and spray the next liquid. CONSTITUTION:A start button 9 which an indicate the start of car washing and the restart after a temporary stop, a stop button 11 which can stop the spray of liquid temporarily on the way of work, in addition to that, an extension button 10 which can extend the spray time of liquid for a prescribed time and a termination button 12 which can terminate the spray of a certain liquid and spray the next liquid, are provided. Respective work stages of a water cleaning course, a shampoo course, a fur eliminating course and a waxing course selected by a selection switch 6 are counted by a control device, but these work stages can be made variable by the extension button 10 and the termination button 12. Thus, an operator can extend and terminate the spray of liquid by himself. Therefore, a car washing work suitable to customer's preference can be carried out depending upon the kind and the grade of dirtiness of a car.

Spray type car washer

PURPOSE:To prevent a reproduced signal from deteriorating, by controlling the characteristics of a reproduced signal processing circuit such as a reproductive equalizer according to the tape running speed of reproduction. CONSTITUTION:If the running speed of a tape has deviation from a normal reproduction speed and the frequency axis of the reproduced signal (a) varies, the equalizing characteristics of the equalizer 2, delay characteristics of a filter 3, and discrimination thresh-old of a data discriminator 4 are all optimized by a control signal (f) outputted from a microcomputer 7 according to variation in relative speed. At the same time, the center frequency of a BPF5 and leading-in characteristics and leading-in center frequency of a PLL6 are optimized by the control signal (f) and a switching signal (g) to supply a clock (p) in the best state from the PLL6 to the data discriminator 4.

Magnetic recording and reproducing device

PURPOSE:To prevetn degradation of the quality of a reproduced picture, by inserting a discimination code between respective channels at a recording time and by decoding a signal for every channel in accordance with the discrimination code at a high-speed mode reproducing time CONSTITUTION:A digital coded input signal 1 is divided into information of two channels by an information dividing circuit 2, and an error correction code is added to respective outputs in block units by encoders 3 and 4, and respective pertinent channel discrimination codes are inserted by channel discrimination code inserting circuits 5 and 6, and these outputs are recorded as an output 7 of a channel 1 and an output 8 of a channel 2 Respective reproduced signals 11 and 12 of channels 1 and 2 have discrimination codes detected by channel discriminating circuits 13 and 14, and switches 15 and 16 are switched to decoders corresponding to discriminated channels Next, after errors are corrected in decorders 17 and 18, reproduced signals are multiplexed by an information multipliexing circuit 19 to obtain an output 20 of the original input code sequence

Digital signal recording and reproducing method

PURPOSE:To facilitate to detect easily a fault of a head and also to adjust simply the circuit by dividing a screen into plural regions and using plural heads to record and reproduce a code signal corresponding to divided regions. CONSTITUTION:A television signal from an input terminal 1 is converted into a pulse code by a coding circuit 3 via a pre-processing circuit 2 such as an amplifier or the like. The code signal is changed over upward/downward in Fig. by a switch 9 at a 1/2 period of scanning lines and the switched signal is written in memories 6A, 7A, 6B and 7B via switches 8A, 8B operated in synchronizing with one scanning line. The output of the memories is applied to recording heads 1A, 1B via switches 5A, 5B and processing circuits 12A, 12B. Thus, left/right picture signals are applied two heads 1A, 1B at the same time at the scanning period of one scanning line and recorded in parallel with tracks A, B.

Recording and reproducing device of digital picture signal

PURPOSE:To reproduce a normal color picture with less deterioration for any video signal having different fields on the way of one line, by performing a chromatic inversion to an input added with redundant data so as to reserve the continuity of a color subcarrier phase. CONSTITUTION:An input video signal of A, B, C channels is given to a point (p) in the variable speed reproduction of a digital VTR recorded in three channels. A redundant data adding circuit 1 forms a signal at a point (q) where the redundant data is added to the last of a video signal A of the beginning of a video signal C, and a signal at a point (r) where the redundant data is added to the beginning and end of a video signal B. Further, the redundant data is produced so that the phase of the color subcarrier is continuous. These data are inputs to chromatic inverters 2, 3. Then, a switch 4 selects an output of the two chromatic inverter and obtains a signal at a point (s) where the chromatic inversion is attained. On the other hand, a signal at a point (t) delayed at a delay circuit 5 is selected by a switch 6 and a video signal at a point (u) is obtained, where the phase of color subcarrier is continuous.

Reproducer of digital video signal

PURPOSE:To easily observe an error of a symbol by providing a means for detecting the error to a recording and reproducing part of a digital signal, making an error flag corresponding to the error including symbol groups a change of signals such as a voltage, a current, and displaying on a visible monitor means. CONSTITUTION:The data recorded on a tape 1 is reproduced, discriminated by a digital signal 4, then a synchronous pattern is detected by a synchronization detector 5, an error is detected by a cyclic redundancy code and the error is corrected by an error correcting circuit 6. Then, the data of plural channels is united by a time base converting circuit 7. The united picture signal 8 examines the error by an error detecting flag 10 and an error correcting flag 11 and interpolates from a picture signal before one field or preceding or succeeding a scanning line. When an error monitor instruction 12 is outputted, an error corrector 9 replaces, the error part by the white signal data instead of correcting it. The replaced data 13 is converted into an analog video signal 15 by a D/A converter 14 and monitored by a color monitor.

Digital magnetic recording and reproducing device

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