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1. 发明专利

JPH09214814A VIDEO CAMERA 失效
公开(公告)号：JPH09214814A
公开(公告)日：1997-08-15
申请号：JP1723696
申请日：1996-02-02
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： MARUYAMA AKIHIKO , MIZUTANI KEIICHI , TSUKAMOTO TOSHIHIKO
IPC分类号： H04N5/225 , H04N5/66
摘要： PROBLEM TO BE SOLVED: To display an easy-to-observe image on a view finder without being affected by surrounding light by providing a back light emission amount control means that changes automatically the light emission amount of a back light depending on the surrounding lightness. SOLUTION: A video signal processed by a digital signal processing circuit 3 is fed to a main control circuit 4 consisting mainly of a microprocessor. The main control circuit 4 acquires information of the lightness of an object based on a mean level of a video signal and applies feedback control to an aperture 1b of a lens section 1 so as to bring the video signal to a prescribed level. The main control circuit 4 acquires the surrounding lightness based on the video signal to control the light emission amount of the back light of the view finder and uses a luminance sensor 10 to acquires luminance information of a display image on a liquid crystal display panel 7. Then the main control circuit 4 obtains proper light emission amount information of the back light based on the information sets above and controls an output voltage of an inverter 5 to change the light emission amount of a fluorescent tube 6.

2. 发明专利

JPS6057274B2 失效
公开(公告)号：JPS6057274B2
公开(公告)日：1985-12-13
申请号：JP6504479
申请日：1979-05-28
申请人： HITACHI LTD
发明人： MIZUTANI KEIICHI , FUNASHIRO HIDEKAZU
IPC分类号： H04N9/793 , H04N9/79 , H04N9/80

3. 发明专利

JPS60162417A POWER SOURCE DISCRIMINATION SYSTEM IN DC POWER SOURCE DRIVE DEVICE 失效
公开(公告)号：JPS60162417A
公开(公告)日：1985-08-24
申请号：JP1512884
申请日：1984-02-01
申请人： HITACHI LTD
发明人： MIZUTANI KEIICHI , IHARA TAKASHI
IPC分类号： H02J7/00 , H02J1/00

4. 发明专利

JPS5782263A Video signal recording and playback device 失效
标题翻译：视频信号记录和回放设备
公开(公告)号：JPS5782263A
公开(公告)日：1982-05-22
申请号：JP15592580
申请日：1980-11-07
申请人： Hitachi Ltd
发明人： MIZUTANI KEIICHI , ICHIMURA SHINYA , KAWAMURA KOUTAROU , TEJIMA TSUNEHIKO , YAMADA KAZUYOSHI , MUTOO KATSUHISA
IPC分类号： H04N5/7826 , G11B27/024 , G11B27/029 , G11B27/036
CPC分类号： G11B27/029 , G11B27/024 , G11B2220/90
摘要： PURPOSE:To enable to insert and record another information without intermission for the recorded content, by providing a means stopping tape erase at insertion recording and a switch controlling the stop of inserted recording. CONSTITUTION:An insertion recording reference signal inputted from an input terminal 1 is applied to an erase current source 4 as it is, the erase current source is stopped by it and no erase current flows to an erase head 5. The VTR is at recording mode with this reference signal. Thus, another information is overlappingly recorded on a recorded tape without erase operation. A switch 2 turns on which can be set before recording after a prescribed time or after tape run amount reaches a prescribed amount. Since the switch 2 turns off during inserted recording, a stop reference signal output is at low level. When the switch turns on and is conductive to ground, the stop reference signal output is at high level and the inserted recording stops with this instruction.
摘要翻译：目的：通过提供在插入记录时停止磁带擦除的手段和控制插入记录停止的开关，能够插入和记录其他信息而不会中断录制的内容。构成：从输入端子1输入的插入记录参考信号原样施加到擦除电流源4，擦除电流源被其停止，并且没有擦除电流流向擦除头5.VTR处于记录模式具有该参考信号。因此，另一信息被重叠地记录在记录的磁带上而不进行擦除操作。在规定时间之后或在磁带运行量达到规定量之后，可以在记录之前设置开关2。由于开关2在插入记录期间关闭，所以停止参考信号输出处于低电平。当开关导通并接地时，停止参考信号输出处于高电平，插入的记录停止该指令。

5. 发明专利

JPH0250523B2 失效
公开(公告)号：JPH0250523B2
公开(公告)日：1990-11-02
申请号：JP309481
申请日：1981-01-14
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , SHIBATA AKIRA , MIURA KUNIAKI , KOJIMA NOBORU , KAWAMURA KOTARO , MIZUTANI KEIICHI , NARITA HIROSHI , KODAMA KOJI
IPC分类号： H04N9/83 , G11B5/008 , G11B5/027

6. 发明专利

JPS57143991A VIDEO RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS57143991A
公开(公告)日：1982-09-06
申请号：JP2843881
申请日：1981-03-02
申请人： HITACHI LTD
发明人： FUNASHIRO HIDEKAZU , MIZUTANI KEIICHI
IPC分类号： H04N9/80 , H04N9/79 , H04N9/84 , H04N9/491
摘要： PURPOSE:To reduce the scale of a circuit by enabling the reproduction of a color signal on NTSC basis and that on PAL basis by using two 1H delay lines. CONSTITUTION:When a color sinal of the NTSC system is inputted, the reproduced color signal input from an input terminal 1 is supplied to an adding circuit 13 directly and through a 1H delay line 3 and a switch circuit 12 which selects a signal passed through the 1H delay line 3, and the adding circuit 13 adds both the input signals to eliminate crosstalk between adjacent tracks, so that a reproduced color signal of the NTSC system appears at an output termnal 6. When a color signal of the PAL system is inputted, the reproduced color input signal is inputted to the adding circuit 13 directly and through 1H delay lines 3 and 11 and the circuit 12 which selects a signal delayed by two horizontal lines through both the delay lines this time, and the circuit 13 adds both the input signals to eliminate crosstalk between adjacent tracks, so that a reproduced color signal of the PAL system appears at the output terminal 6. Consequently, this device enables reception on those two systems by using two 1H delay lines although a 1H delay line and a 2H delay line are both necessary in a conventional device.

7. 发明专利

JPS55158790A COLOR VIDEO SIGNAL RECORDER*REPRODUCER 失效
公开(公告)号：JPS55158790A
公开(公告)日：1980-12-10
申请号：JP6504479
申请日：1979-05-28
申请人： HITACHI LTD
发明人： MIZUTANI KEIICHI , FUNASHIRO HIDEKAZU
IPC分类号： H04N9/793 , H04N9/79 , H04N9/80 , H04N9/491
摘要： PURPOSE:To ensure the assured decision in both the SECAM and PAL systems with no malfunction, by setting the killer threshold level of the SECAM color killer detection circuit of the reproducing time than that of the recording time. CONSTITUTION:Diode D2, resistance R2 and capacitor C3 each are provided to the SECAM color killer detection circuit. As a result, the DC voltage is applied to terminal 4 only at the reproducing time. Accordingly, diode D2 conducts at the reproducing time, and capacitor C3 is connected to the collector of transistor Q2 constituting the tuning-type amplifier. In this connection, the tuning frequency is shifted, and the collector output level of Q2 lowers down at the reproducing time. Thus the color killer threshold level of the reproducing time becomes higher than that of the recording time. As a result, the malfunction caused by reproduction of the PAL color signal can be eliminated without impairing the detecting capacity of the SECAM color signal.

8. 发明专利

JPS5558686A COLOR VIDEO SIGNAL RECORDING AND REPRODUCTING DEVICE 失效
公开(公告)号：JPS5558686A
公开(公告)日：1980-05-01
申请号：JP6677778
申请日：1978-06-05
申请人： HITACHI LTD
发明人： MIZUTANI KEIICHI , NAKAGAWA HIMIO
IPC分类号： G11B20/02 , G11B5/027 , H04N9/793 , H04N9/84 , H04N9/87
摘要： PURPOSE:To generate ID (identification) pulses of a sufficient peak value for the purpose of obtaining color signals having a normal phase at a reproducing time. CONSTITUTION:The reference signal of phase phi1 and the burst signal of phase phi2 are applied to terminals 1 and 2 of killer detecror 10 respectively, and an instantaneous current is flowed as shown in arrow A or absorbed as shown in arrow B according to their phase difference. Meanwhile, color signals are inputted to terminal 7 of killer amplifier 11; and under the state as shwon in arrow A, high frequency components and low frequency components are flowed to capacitors C1 and C2 respectively, and a faint current is flowed to diode D1 to turn on transistor Q3, and color signals are outputted from terminal 8. Under the state as shown in arrow B, Q4 is turned on, and no output is issued from terminal 8. In ID pulse generation circuit 12, Q6 is saturated, and most of the instantaneous current of detector 10 is flowed to capacitor C2 by making capacitor C2 about ten times as large as capacitor C1; and therefore, under the state as shown in arrow B, Q6 is broken, and terminal 9 becomes a high level volrage instantanously, and sufficiently large ID pulses are generated.

9. 发明专利

JPS5523605A RECORDING AND REPRODUCING UNIT FOR COLOR VIDEO SIGNAL 失效
公开(公告)号：JPS5523605A
公开(公告)日：1980-02-20
申请号：JP7645578
申请日：1978-06-26
申请人： HITACHI LTD
发明人： MIZUTANI KEIICHI , NAKAGAWA HIMIO
IPC分类号： G11B20/02 , G11B5/027 , H04N9/70 , H04N9/793
摘要： PURPOSE:To keep the phase difference between the input subcarriers of the both detectors correctly at + or -90 deg., by inverting one input subcarrier of the APC and killer detectors at recording and reproduction, through the selective operation of the differential amplifier. CONSTITUTION:The current source I of the differential pair is selected, and the differential pair is operated alternatively, to invert the output signal at the terminal 6, i.e., the input subcarrier of one detector at recording and reproduction. Further, the transmission path of the subcarrier to reach the output terminal is only via the differential pair of one stage both for the signals at the terminal 5 and 6, and the base to collector and the collector to ground capacitance of the transistor in OFF state can be negligible with smaller load resistor r, allowing the phase difference between the output signals at the both output terminals, i.e., the phase difference between the both detectors to be selected to surely +90 deg. and - 90 deg. at recording and reproduction.

10. 发明专利

JPH08289183A VIDEO AND AUDIO SIGNAL LIGHT RECEIVER 失效
公开(公告)号：JPH08289183A
公开(公告)日：1996-11-01
申请号：JP8791495
申请日：1995-04-13
申请人： HITACHI LTD
发明人： KOBAYASHI JUN , MIZUTANI KEIICHI
IPC分类号： H04N5/225 , G11B33/00
摘要： PURPOSE: To suppress the increment of a cost by disusing a power source dedicated for light receiver. CONSTITUTION: This receiver is equipped with a battery charge means 17 which charges a battery which drives a camcorder, and a light receiving means 16 which converts a light signal transmitted from the camcorder to an electrical signal and after that, demodulates it to video and audio signals. The power supply of the light receiving means 16 is received from the battery charge means 17 directly or via a connector, and the light receiving means 16 is integrated with the battery charge means 17.

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