JP2002290840A - Imaging device - Google Patents

Abstract

(57) [Problem] To provide an image pickup apparatus which does not mix noise into a video output due to a cooling operation of an image pickup element and is applicable to a video camera which does not take an image by opening and closing an aperture. SOLUTION: A blanking period of the image pickup device is specified based on an image pickup device blanking signal, and the cooling element 12 and the dehumidifier 1 are out of the blanking period, that is, outside the video output period.
The power supply operation of No. 4 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus, and more particularly to an image pickup apparatus for suppressing noise generation.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing a conventional image pickup apparatus disclosed in, for example, Japanese Patent Laid-Open No. 4-20183. In FIG. 7, 1 is a lens, 2 is an aperture, 3 is an image sensor, 51 is a drive circuit for driving the aperture 2, 52 is a drive circuit for driving the image sensor 3, 53 is a video signal processing circuit, 54
Is a magnetic disk drive, 55 is a control circuit, 56 is a photometric element, 57 is a drive circuit for driving the photometric element 56, 58 is a release switch operated when taking a picture, and 12 is a cooling element for cooling the image sensor 3. , 13 are cooling elements 12
Is a cooling element control unit that controls the temperature.

In FIG. 7, light from a subject (not shown) is incident on an image sensor 3 via a lens 1 and a diaphragm 2.
The image sensor 3 generates a video signal corresponding to the image of the subject,
Output to the video signal processing circuit 53. The video signal output from the image sensor 3 is processed in the video signal processing circuit 53, and the FM-modulated video signal is output to the magnetic disk device 54.
, And recorded on a video floppy (registered trademark) (not shown).

A control circuit 55 composed of a microcomputer (MPU) or the like
To perform a photometric operation. The diaphragm 2 and the image sensor 3 are driven via the drive circuits 51 and 52 in accordance with the photometric results.

FIG. 8 is a waveform chart for explaining the operation of the image pickup apparatus shown in FIG. Hereinafter, the operation of the conventional imaging apparatus will be described in detail with reference to the timing chart of FIG. Release switch 58
When is pressed halfway, the control circuit 55 drives the photometric element 56 via the drive circuit 57 to measure the exposure state of the subject.
The control circuit 55 calculates the amount of exposure from the output of the photometric element 56. When the release switch 58 changes from the half-pressed state to the fully-pressed state (FIG. 8A), the control circuit 55 controls the drive circuit 51 in accordance with the calculation result to open the aperture 2 (FIG. 8).
B). As a result, the light incident from the lens 1 is
After being adjusted to an appropriate light amount, the light is incident on the image sensor 3. The control circuit 55 outputs a control signal (FIG. 8C) to the cooling element control unit 13, and drives the cooling element 12 until the aperture 2 is closed (or until recording on the video floppy is completed).

The period until the diaphragm 2 is closed is C
Dark current noise of the image pickup device 3 typified by a CD is likely to occur, and this dark current noise becomes significant when the temperature around the image pickup device rises.
By cooling the image sensor 3 around this period, dark current noise is suppressed. Then, after the aperture 2 is closed, the control circuit 55 generates a recording gate signal (FIG. 8D) to drive the drive circuit 23, reads out a video signal from the image sensor 3, and outputs it to the video signal processing circuit. Then, the video signal processed in the video signal processing circuit 53 is supplied to the magnetic disk device 54 and recorded on the video floppy.

[0007]

However, in the above-described conventional image pickup apparatus, since the driving period of the cooling element 12 is related to the open / close state of the stop 2, it cannot be applied to a video camera that does not take an image by opening and closing the stop. There were challenges.

Further, when the cooling element 12 is driven until the recording to the video floppy is completed, the cooling control ON and OFF timings overlap the video output period. There is also a problem that noise is mixed into an image due to a transient current change.

Furthermore, there is another problem that dew condensation occurs on the electronic components around the cooling element due to the intermittent cooling, which causes malfunction and destruction of the electronic components.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an image pickup apparatus free from noise due to a cooling operation and applicable to a video camera. This is the first purpose.

In addition to the first object, a second object is to provide an image pickup apparatus for preventing malfunction and destruction of electronic components due to dew condensation.

[0012]

An image pickup apparatus according to the present invention comprises: an image pickup device for converting an optical image of a subject into a video signal;
An image sensor blanking generation circuit that generates an image sensor blanking signal during a blanking period of the image sensor; a cooling element that cools the image sensor; and a cooling element controller that controls driving of the cooling element. The section turns on the power of the cooling element while the imaging element blanking signal from the imaging element blanking generation circuit is being input.

[0013] In the imaging apparatus according to the present invention, when the cooling element control unit cuts off the power of the cooling element,
This is performed while the image sensor blanking signal is input from the image sensor blanking generation circuit.

An image pickup apparatus according to the present invention is an image pickup apparatus provided with an image pickup device for converting an optical image of a subject into a video signal and a cooling device for cooling the image pickup device. It is provided.

Further, the image pickup apparatus according to the present invention further includes an image pickup device blanking generation circuit for outputting an image pickup device blanking signal during a blanking period of the image pickup device, and a dehumidification control unit for controlling the driving of the dehumidifier. The dehumidification control unit turns on the power of the dehumidifier while the image sensor blanking signal is being input from the image sensor blanking generation circuit.

Further, in the imaging apparatus according to the present invention,
The dehumidification control unit is configured to shut off the power of the dehumidifier while the image sensor blanking signal is input from the image sensor blanking generation circuit.

An image pickup device according to the present invention includes an image pickup device for converting an optical image of a subject into a video signal, an image pickup device blanking generation circuit for generating an image pickup device blanking signal during a blanking period of the image pickup device, and an image pickup device. A cooling element that cools the cooling element, a cooling element control unit that performs drive control of the cooling element, a dehumidifier that dehumidifies the periphery of the cooling element, and a dehumidification control unit that performs drive control of the dehumidifier. When performing power-on or power-off of the cooling element, so as to perform while the imaging element blanking signal from the imaging element blanking generation circuit is input, and the dehumidification control unit,
When the power of the dehumidifier is turned on or off, the power is turned off while the image sensor blanking signal is input from the image sensor blanking generation circuit.

An image pickup apparatus according to the present invention comprises: an image pickup device for converting an optical image of a subject into a video signal; an image pickup device blanking generation circuit for generating an image pickup device blanking signal during a blanking period of the image pickup device; A video blanking generation circuit that generates a video blanking signal during a blanking period of a video signal obtained by converting the video signal of
A cooling element that cools the imaging element; and a cooling element control unit that controls the driving of the cooling element. The cooling element control unit performs imaging from the imaging element blanking generation circuit when powering on the cooling element. Element blanking signal is input,
In addition, it is performed while the video blanking signal from the video blanking generation circuit is being input.

In the imaging apparatus according to the present invention, when the power supply of the cooling element is cut off, the cooling element control unit receives an imaging element blanking signal from the imaging element blanking generation circuit and outputs a video blanking signal. This is performed while the video blanking signal is being input from the generation circuit.

An image pickup apparatus according to the present invention comprises: an image pickup device for converting an optical image of a subject into a video signal; an image pickup device blanking generation circuit for generating an image pickup device blanking signal during a blanking period of the image pickup device; A video blanking generation circuit that generates a video blanking signal during a blanking period of a video signal obtained by converting the video signal of
A cooling element for cooling the imaging element, a cooling element controller for controlling the driving of the cooling element, a dehumidifier for dehumidifying the periphery of the cooling element, and a dehumidifying controller for controlling the driving of the dehumidifier; When the power of the dehumidifier is turned on, while the imaging element blanking signal from the imaging element blanking generation circuit is input, and while the video blanking signal from the video blanking generation circuit is input, Is what you do.

In the imaging apparatus according to the present invention, when the power supply of the dehumidifier is cut off, the dehumidification control section receives an imaging element blanking signal from the imaging element blanking generation circuit and generates a video blanking signal. This is performed while the video blanking signal is being input from the circuit.

An image pickup apparatus according to the present invention comprises: an image pickup device for converting an optical image of a subject into a video signal; an image pickup device blanking generating circuit for generating an image pickup device blanking signal during a blanking period of the image pickup device; A video blanking generation circuit that generates a video blanking signal during a blanking period of a video signal obtained by converting the video signal of
A cooling element for cooling the imaging element, a cooling element control unit for controlling the driving of the cooling element, a dehumidifier for dehumidifying the periphery of the cooling element, and a dehumidifying control unit for controlling the driving of the dehumidifier; When the power of the cooling element control unit is turned on or off, the unit receives an image sensor blanking signal from the image sensor blanking generation circuit, and receives a video blanking signal from the video blanking generation circuit. To be performed while being input, the dehumidifier control unit, when performing power on or power off of the dehumidification control unit, the image sensor blanking signal from the image sensor blanking generation circuit is input, In addition, the operation is performed while the video blanking signal from the video blanking generation circuit is being input.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram illustrating a configuration of an imaging device according to Embodiment 1 of the present invention. In FIG. 1, portions having the same functions as those of the related art shown in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, 4 is a video signal processing circuit, 5 is a video signal output terminal, 6 is an image sensor driving circuit, 7 is a reference signal generator, 8 is a video signal processing pulse generation circuit, 9 is a dehumidifier, and 10 is dehumidification control. Reference numeral 11 denotes a humidity sensor, and 14 denotes a temperature sensor.

In FIG. 1, light from a subject (not shown) is incident on an image pickup device 3 via a lens 1 and a diaphragm 2. The imaging device 3 is driven by the imaging device driving circuit 6 to generate a video signal corresponding to the image of the subject, and outputs the video signal to the video signal processing circuit 4. The video signal processing circuit 4 processes the video signal from the image sensor 3 at the timing of the pulse from the video signal processing pulse generation circuit 8 to generate a video signal,
Output to the video signal output terminal 5.

The reference signal generator 7 generates a reference signal and outputs it to the image pickup device driving circuit 6 and the video signal processing pulse generating circuit 8, respectively. The image sensor driving circuit 6 generates a drive pulse for operating the image sensor 3 based on the reference signal from the reference signal generator 7 and outputs the drive pulse to the image sensor 3. As a result, a video signal is generated by scanning the image sensor 3 and output to the video signal processing circuit 4. This read operation electrically replaces the image pickup device exposure processing by opening and closing the aperture 2 shown in the conventional example, and enables an operation of continuously reading a video signal. The image sensor driving circuit 6 has a built-in image sensor blanking generation circuit for generating a blanking signal for interpolating between the scans, and is output from the image sensor 3 to the dehumidification control unit 10 and the cooling device control unit 13. An H-level image sensor blanking signal indicating a blanking period of the video signal is generated. On the other hand, the video signal processing pulse generation circuit 8 generates a pulse based on the reference signal from the reference signal generator 7 and outputs the pulse to the video signal processing circuit 4. The operation of the video signal processing circuit 4 which has received the pulse from the video signal processing pulse generation circuit 8 is as described above. The video signal processing pulse generation circuit 8 has a built-in video blanking generation circuit and generates an H-level video blanking signal indicating a blanking period of the video signal.

The temperature sensor 14 is disposed near the image sensor 3 and detects the temperature around the image sensor 3.
If the detected value is less than the specified value, an L level signal is output to the cooling element control unit 13 if the detected value is not less than the specified value. Upon receiving the H level signal from the temperature sensor 14, the cooling element control unit 13 determines that cooling is necessary, and supplies power to the cooling element 12 at a predetermined timing thereafter (detailed later). To start cooling.

The humidity sensor 11 detects the humidity in an airtight container 25 shown in FIG. 3 which contains and seals the image pickup device 3 and the cooling device 12 therein. In this case, an L level signal is output to the dehumidification control unit 10, and when it is equal to or more than a specified value, an H level signal is output to the dehumidification control unit 1.
Output to 0. When the H level signal from the humidity sensor 11 is input, the dehumidification control unit 10 determines that dehumidification is necessary, and supplies power to the dehumidifier 9 at a predetermined timing thereafter (detailed later), and controls the dehumidifier 9 to operate. It drives to dehumidify. The dehumidifier 9 dehumidifies the inside of a closed container 25 shown in FIG.
By reducing the humidity, dew condensation generated around the cooling element 12 when the imaging element 3 is cooled by the cooling element 12 is prevented. The dehumidifier 9 used here removes moisture by electrolysis, and its principle will be described with reference to the following drawings.

FIG. 2 is a diagram for explaining the dehumidifying principle of the dehumidifier of FIG. The dehumidifier 9 has a solid polymer electrolyte membrane 21 and a pair of porous electrodes 22 and 23,
The pair of porous electrodes 22 and 23 are formed of the solid polymer electrolyte membrane 2.
1 are sandwiched therebetween. Further, the porous electrodes 22 and 23 are connected to an anode and a cathode of the DC power supply 24, respectively. When a voltage is applied to the DC power supply 24, moisture on the anode side (water molecules H ₂ O in the figure) is dissociated into hydrogen ions (H ⁺ ) and oxygen (O), and the hydrogen ions are converted into solid polymer. It moves in the electrolyte membrane 21 and reaches the porous electrode 23 side, and reacts with oxygen in the air to form water molecules (H ₂ O gas).
It is released next. Therefore, dehumidification is performed on the anode side, and dehumidification is performed on the cathode side.

The dehumidifier 9 configured as described above is arranged as shown in the following figures. FIG. 3 is a schematic cross-sectional view showing the appearance of the imaging apparatus according to this embodiment. In FIG. 3, reference numeral 25 denotes a container that seals at least the imaging element 3 and the cooling element 12. The dehumidifier 9 has a porous electrode 22 on the anode side in a through hole provided in the container 25. The porous electrode 23 on the cathode side is fitted and fixed so as to face the outside of the closed vessel 25. Thereby, the closed container 25
Is dehumidified, and the condensation by the cooling element 12 can be prevented.

The dehumidification controller 10 shown in FIG. 1 supplies power to the dehumidifier 9 to perform dehumidification when the signal from the humidity sensor 11 is an H level signal, that is, when the humidity is equal to or higher than a specified value. The relationship between the rush current and the humidity when the power of the dehumidifier 9 is turned on is shown in the following figure.

FIG. 4 is a diagram showing the relationship between the rush current and the humidity when the power of the dehumidifier is turned on on a time axis. The horizontal axis represents time, the vertical axis represents current value and humidity, and shows a case where the power is turned on for 1 minute on the time axis and the power is turned off for 14 minutes. FIG. 4 shows that the dehumidifier 9 has a characteristic that a large current flows when the power is turned on when the humidity is high. In this example, an inrush current of about 4 A flows.

While the dehumidifier 9 has such characteristics, it is arranged near the image pickup device 3 which is easily affected by noise, so that the power is turned on during the video output period of the image pickup device 3. Then, noise may be mixed into the video signal due to the inrush current. Further, as described in the above-mentioned problem, when the ON / OFF timing of the cooling element 12 overlaps with the video output period, noise may be mixed into the video. For this reason, in the present embodiment, control is performed such that power operation for the dehumidifier 9 and the cooling element 12, that is, each device related to cooling of the imaging element 3 is performed outside the video output period of the imaging element 3. Thus, the entry of noise due to the power operation of these devices is prevented. Note that the timing of performing the power operation is conditionally the same for both the dehumidifier 9 and the cooling element 12. Therefore, the influence on the video signal during the power operation is greater than that of the cooling element 12 here. The case of the dehumidifier 9 will be described with reference to the drawings.

FIG. 5 is a waveform chart for explaining the operation of the first embodiment of the present invention. 5, reference numeral 31 denotes an image sensor blanking signal output from the image sensor driving circuit 6 to the dehumidifier 9 and the cooling element 12, respectively, 32 denotes a video signal (image sensor image output signal), and 33 denotes an output signal of the humidity sensor 11. And 34 are drive signals (power ON timing) to the dehumidifier 9. The image sensor image output signal 32 indicates a signal output in a vertical cycle, and the image sensor blanking signal 31
Is at the H level during a blanking period (that is, a period other than video output).

The dehumidification control unit 10 controls so that the power of the dehumidifier 9 is turned on at the timing when the output signal 33 from the humidity sensor 11 becomes H level, and thereafter, when the image sensor blanking signal 31 becomes H level. (Waveform 3 in FIG. 5
4). In this way, by turning on the power supply during the blanking period of the image sensor 3 based on the image sensor blanking signal 31, that is, outside the image output period, even if a rush current flows due to the dehumidifier ON, the image is output at this time. No noise is mixed into the video. Although not shown, the output signal from the temperature sensor 14 for the cooling element 12 becomes the H level as in the case of the dehumidifier 9 shown in FIG. 5, and then the imaging element blanking signal 31 becomes the H level. The control is performed so that the power of the cooling element 12 is turned on at the timing when it becomes. By controlling in this way, it is possible to prevent noise from being mixed in the video due to a large fluctuation in the current value due to the cooling element being turned on, and to obtain a good image.

As described above, in the first embodiment, since the power supply of the cooling element 12 is performed outside the video output period, it is possible to reliably prevent noise from being mixed into the video due to the current value fluctuation. The power-on timing is
This embodiment is based on the image sensor blanking signal 31 output from the image sensor driving circuit 6 and does not depend on the state of the aperture unlike the conventional art. Is applicable.

Further, since the dehumidifier 9 is provided in the vicinity of the cooling element 12, it is possible to prevent malfunction and destruction of electronic component sound due to dew condensation.

Further, since the power supply of the dehumidifier 9 is performed outside the video output period as in the case of the cooling element 12, it is possible to reliably prevent noise from being mixed in the video due to the rush current at the time of power supply. Can be.

In the first embodiment, the control at the power-on timing has been described. However, even when the power is turned off, the power supply current may suddenly change and noise may be mixed.
By shutting off at the same timing as above, the same effect as above can be obtained. That is, with respect to the dehumidifier 9, the output signal of the humidity sensor 11 becomes an L level signal, and thereafter, the signal is cut off at the timing when the imaging element blanking signal 31 becomes H level. Is turned to an L level signal, and then cut off at the timing when the image sensor blanking signal 31 becomes H level, thereby preventing noise from being mixed in and obtaining a good image.

Embodiment 2 FIG. 6 is a waveform chart for explaining the operation of the second embodiment of the present invention. In FIG.
41 is a video image output signal of the video signal output terminal 5, 4
2 is a video signal processing pulse generation circuit 8 to a dehumidification control unit 1
0 and a video blanking signal output to the cooling element control unit 13, respectively. Video image output signal 4
1. The video blanking signal 42 is delayed compared to the image sensor blanking signal 31 and the image sensor video output signal 32, but this is due to the signal delay of the video signal processing circuit 4.

In the second embodiment, the power supply of the dehumidifier 9 is changed to the image sensor blanking signal 31 and the video blanking signal 42 after the output signal of the humidity sensor 11 becomes H level.
Are turned on at the timing when both become H level (waveform 34 in FIG. 6). Although not shown, the output signal from the temperature sensor 14 also goes high for the cooling element 12 as in the case of the dehumidifier 9 shown in FIG. 6, and then the imaging element blanking signal 31 goes high. The control is performed so that the power is turned on at the timing when the power supply is turned off. With this configuration, it is possible to reliably prevent noise from being mixed into the image due to the rush current when the dehumidifier is ON and the current value fluctuation when the cooling element is ON, for both the image sensor image and the video image. And a good image can be obtained.

In the second embodiment, the timing when the power is turned on has been described. However, even when the power is turned off, the power current may suddenly change and noise may be mixed. The same effect as described above can be obtained. That is, the dehumidifier 9 is shut off when the output signal of the humidity sensor 11 becomes L level, and thereafter, when both the image sensor blanking signal 31 and the video blanking signal 41 become H level,
In addition, as for the cooling element 12, the output from the temperature sensor 14 becomes an L level signal, and thereafter, when the imaging element blanking signal 31 and the video blanking signal 41 both become H level, the noise is cut off. Is prevented, and a good image can be obtained.

[0042]

According to the present invention, there is provided an imaging device for converting an optical image of a subject into a video signal, an imaging device blanking generation circuit for generating an imaging device blanking signal during a blanking period of the imaging device, A cooling element that cools the imaging element; and a cooling element control unit that controls the driving of the cooling element. When the cooling element is turned on, the cooling element control unit performs imaging from the imaging element blanking generation circuit. Since this operation is performed while the element blanking signal is being input, it is possible to prevent noise from being mixed in the image due to a current value fluctuation when the cooling element is turned on, and to obtain a good image.

In the imaging device according to the present invention, when the cooling element control unit cuts off the power of the cooling element,
Since this is performed while the image sensor blanking signal from the image sensor blanking generation circuit is being input, it is possible to prevent noise from being mixed into the video due to current value fluctuation when the cooling device power is turned off, and to obtain a good image. be able to.

An image pickup apparatus according to the present invention is an image pickup apparatus provided with an image pickup device for converting an optical image of a subject into a video signal and a cooling device for cooling the image pickup device. With the provision, the dew condensation can be prevented from being generated around the cooling element, and thereby, it is possible to prevent malfunction and destruction of the electronic components provided around the cooling element.

Further, the image pickup apparatus according to the present invention further includes an image pickup device blanking generation circuit for outputting an image pickup device blanking signal during a blanking period of the image pickup device, and a dehumidification control unit for controlling the driving of the dehumidifier. The dehumidification control unit is configured to turn on the power of the dehumidifier when the image sensor blanking signal is input from the image sensor blanking generation circuit. Noise can be prevented from being mixed in the video due to the current, and a good image can be obtained.

Further, in the imaging apparatus according to the present invention,
The dehumidifier control unit is configured to shut off the power of the dehumidifier while the image sensor blanking signal is input from the image sensor blanking generation circuit. Noise can be prevented from being mixed into the video due to the fluctuation, and a good image can be obtained.

An image pickup device according to the present invention includes an image pickup device for converting an optical image of a subject into a video signal, an image pickup device blanking generation circuit for generating an image pickup device blanking signal during a blanking period of the image pickup device, and an image pickup device. A cooling element that cools the cooling element, a cooling element control unit that performs drive control of the cooling element, a dehumidifier that dehumidifies the periphery of the cooling element, and a dehumidification control unit that performs drive control of the dehumidifier. When performing power-on or power-off of the cooling element, so as to perform while the imaging element blanking signal from the imaging element blanking generation circuit is input, and the dehumidification control unit,
When turning on or off the power of the dehumidifier, it is performed while the image sensor blanking signal is input from the image sensor blanking generation circuit.
This makes it possible to prevent noise from being mixed into the image when any of the power supplies of the cooling element is operated, and to provide an imaging apparatus that is excellent in preventing noise from being mixed due to the cooling operation.

An image pickup apparatus according to the present invention comprises: an image pickup device for converting an optical image of a subject into a video signal; an image pickup device blanking generation circuit for generating an image pickup device blanking signal during a blanking period of the image pickup device; A video blanking generation circuit that generates a video blanking signal during a blanking period of a video signal obtained by converting the video signal of
A cooling element that cools the imaging element; and a cooling element control unit that controls the driving of the cooling element. The cooling element control unit performs imaging from the imaging element blanking generation circuit when powering on the cooling element. Element blanking signal is input,
In addition, since the operation is performed while the video blanking signal from the video blanking generation circuit is being input, noise is prevented from being mixed in the image due to current value fluctuation when the cooling element is turned on for both the image sensor image and the video image. And a good image can be obtained.

In the image pickup apparatus according to the present invention, when the power of the cooling element is cut off, the cooling element control section receives the image pickup element blanking signal from the image pickup element blanking generation circuit and outputs the video blanking signal. Since this is performed while the video blanking signal is being input from the generation circuit, it is possible to prevent noise from being mixed into the video due to current value fluctuation when the power to the cooling device is shut off, for both the image sensor video and the video video And a good image can be obtained.

An image pickup apparatus according to the present invention comprises: an image pickup element for converting an optical image of a subject into a video signal; an image pickup element blanking generation circuit for generating an image pickup element blanking signal during a blanking period of the image pickup element; A video blanking generation circuit that generates a video blanking signal during a blanking period of a video signal obtained by converting the video signal of
A cooling element for cooling the imaging element, a cooling element controller for controlling the driving of the cooling element, a dehumidifier for dehumidifying the periphery of the cooling element, and a dehumidifying controller for controlling the driving of the dehumidifier; When the power of the dehumidifier is turned on, while the imaging element blanking signal from the imaging element blanking generation circuit is input, and while the video blanking signal from the video blanking generation circuit is input, Therefore, it is possible to prevent noise from being mixed into the image due to the rush current when the dehumidifier is turned on, for both the image sensor image and the video image, and to obtain a good image.

In the imaging apparatus according to the present invention, when the power supply of the dehumidifier is cut off, the dehumidification control unit receives an imaging element blanking signal from the imaging element blanking generation circuit and generates a video blanking signal. Since this is performed while the video blanking signal is being input from the circuit, it is possible to prevent noise from being mixed into the video due to current value fluctuation when the power of the dehumidifier is cut off, for both the image sensor video and the video video. And good images can be obtained.

An image pickup apparatus according to the present invention comprises: an image pickup device for converting an optical image of a subject into a video signal; an image pickup device blanking generation circuit for generating an image pickup device blanking signal during a blanking period of the image pickup device; A video blanking generation circuit that generates a video blanking signal during a blanking period of a video signal obtained by converting the video signal of
A cooling element for cooling the imaging element, a cooling element control unit for controlling the driving of the cooling element, a dehumidifier for dehumidifying the periphery of the cooling element, and a dehumidifying control unit for controlling the driving of the dehumidifier; When the power of the cooling element control unit is turned on or off, the unit receives an image sensor blanking signal from the image sensor blanking generation circuit, and receives a video blanking signal from the video blanking generation circuit. To be performed while being input, the dehumidifier control unit, when performing power on or power off of the dehumidification control unit, the image sensor blanking signal from the image sensor blanking generation circuit is input, In addition, since the operation is performed while the video blanking signal from the video blanking generation circuit is being input, even when the power of the dehumidifier or the cooling element is operated, the image is not displayed. Noise contamination becomes possible to prevent both of the image sensor image and video images,
It is possible to provide an imaging device that is more excellent in preventing noise from being caused by the cooling operation.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an imaging device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the dehumidification principle of the dehumidifier in FIG.

FIG. 3 is a schematic cross-sectional view of the appearance of the imaging device of FIG.

FIG. 4 is a diagram for explaining characteristics of a dehumidifier.

FIG. 5 is a waveform chart illustrating an operation of the first embodiment of the present invention.

FIG. 6 is a waveform chart illustrating an operation of the second embodiment of the present invention.

FIG. 7 is a diagram for explaining a conventional imaging device.

FIG. 8 is a waveform diagram illustrating an operation of a conventional imaging device.

[Explanation of symbols]

Reference Signs List 3 image sensor, 4 video signal processing circuit, 6 image sensor drive circuit (image sensor blanking generation circuit), 8 video signal processing pulse generation circuit (video blanking generation circuit), 9 dehumidifier, 10 dehumidification controller, 12 cooling Element, 13 Cooling element control unit.

Claims (11)

[Claims] An imaging device that converts an optical image of a subject into a video signal; an imaging device blanking generation circuit that generates an imaging device blanking signal during a blanking period of the imaging device; and a cooling device that cools the imaging device. A cooling element control unit for controlling the driving of the cooling element, wherein the cooling element control unit, when turning on the power of the cooling element, the imaging element from the imaging element blanking generation circuit An image pickup apparatus, which performs the operation while a blanking signal is being input. 2. The cooling element control section, when shutting off the power of the cooling element, performs the shutoff while the imaging element blanking signal is input from the imaging element blanking generation circuit. The imaging device according to claim 1. 3. An image pickup apparatus comprising: an image pickup device for converting an optical image of a subject into a video signal; and a cooling device for cooling the image pickup device, wherein a dehumidifier for dehumidifying a periphery of the cooling device is provided. Characteristic imaging device. 4. An image pickup device blanking generation circuit that outputs an image pickup device blanking signal during a blanking period of the image pickup device, and a dehumidification control unit that controls driving of the dehumidifier. 4. The imaging apparatus according to claim 3, wherein the power of the dehumidifier is turned on while the imaging element blanking signal from the imaging element blanking generation circuit is being input. 5. The dehumidification control unit, when shutting off the power supply of the dehumidifier, performs the operation while the image sensor blanking signal is input from the image sensor blanking generation circuit. The imaging device according to claim 3 or 4, wherein 6. An image sensor for converting an optical image of a subject into a video signal, an image sensor blanking generation circuit for generating an image sensor blanking signal during a blanking period of the image sensor, and cooling for cooling the image sensor. An element, a cooling element control unit for controlling the driving of the cooling element, a dehumidifier for dehumidifying the periphery of the cooling element, and a dehumidifying control unit for controlling the driving of the dehumidifier. When powering on or powering off the cooling element, so as to perform while the imaging element blanking signal is input from the imaging element blanking generation circuit, and the dehumidification control unit, When powering on or powering off the dehumidifier is performed, it is performed while the image sensor blanking signal is being input from the image sensor blanking generation circuit. An imaging device characterized by the following. 7. An image sensor for converting an optical image of a subject into a video signal, an image sensor blanking generation circuit for generating an image sensor blanking signal during a blanking period of the image sensor, and a video signal of the image sensor. A video blanking generation circuit that generates a video blanking signal during a blanking period of the converted video signal; a cooling element that cools the imaging element; and a cooling element control unit that performs drive control of the cooling element. When the cooling element control unit turns on the power of the cooling element, the imaging element blanking signal from the imaging element blanking generation circuit is input, and the video from the video blanking generation circuit is input. An image pickup apparatus, which performs the operation while a blanking signal is being input. 8. The cooling element control section receives an image sensor blanking signal from the image sensor blanking generation circuit and shuts off the video blanking generation circuit when powering off the cooling element. 8. The image pickup apparatus according to claim 7, wherein the control is performed while the video blanking signal is input from the camera. 9. An imaging device for converting an optical image of a subject into a video signal, an imaging device blanking generation circuit for generating an imaging device blanking signal during a blanking period of the imaging device, and a video signal of the imaging device. A video blanking generation circuit that generates a video blanking signal during a blanking period of the converted video signal; a cooling element that cools the imaging element; a cooling element control unit that performs drive control of the cooling element; A dehumidifier that dehumidifies the periphery of the cooling element; and a dehumidification control unit that performs drive control of the dehumidifier. The dehumidification control unit generates the image sensor blanking when the power of the dehumidifier is turned on. While the image sensor blanking signal is input from the circuit, and the video blanking signal is input from the video blanking generation circuit, Imaging device according to claim Ukoto. 10. The dehumidification control unit, when shutting off a power supply of the dehumidifier, receives an image sensor blanking signal from the image sensor blanking generation circuit, and
10. The image pickup apparatus according to claim 9, wherein the operation is performed while the video blanking signal is input from the video blanking generation circuit. 11. An imaging device for converting an optical image of a subject into a video signal, an imaging device blanking generation circuit for generating an imaging device blanking signal during a blanking period of the imaging device, and a video signal of the imaging device. A video blanking generation circuit that generates a video blanking signal during a blanking period of the converted video signal; a cooling element that cools the imaging element; a cooling element control unit that performs drive control of the cooling element; A dehumidifier that dehumidifies the periphery of the cooling element, and a dehumidification control unit that performs drive control of the dehumidifier, wherein the cooling element control unit performs power-on or power-off of the cooling element control unit. An image sensor blanking signal is input from the image sensor blanking generation circuit, and the video blanking signal from the video blanking generation circuit is input. When the signal is input, the dehumidifier control unit, when turning on or off the power of the dehumidification control unit, the image sensor blanking from the image sensor blanking generation circuit An image pickup apparatus, wherein the operation is performed while a signal is being input and the video blanking signal is being input from the video blanking generation circuit.