CN106210459A - Camera head - Google Patents
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- CN106210459A CN106210459A CN201510450653.4A CN201510450653A CN106210459A CN 106210459 A CN106210459 A CN 106210459A CN 201510450653 A CN201510450653 A CN 201510450653A CN 106210459 A CN106210459 A CN 106210459A
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- crystal shutter
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- shutter
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Abstract
The present invention provides a kind of distortion that can suppress subject and suppresses the camera head rocked of subject simultaneously.The camera head of the present invention includes: liquid crystal shutter (30), and because voltage applies, transmitance reduces；CMOS (40)；Lens (10), make the photoimaging of target area；Shutter control portion (63), carries out the open and close controlling of liquid crystal shutter (30)；And image sensor control portion (62).Liquid crystal shutter (30) is arranged in side, target area relative to CMOS (40).The part during charge accumulation in the image sensor control portion (62) each circuit in CMOS (40) controls CMOS (40) in the way of coinciding with one another, shutter control portion (63) by all circuits coincide with one another during charge accumulation repeat accumulation during in CMOS (40) expose in the way of control liquid crystal shutter (30).
Description
Technical field
The present invention relates to a kind of image sensor (image sensor) having and every circuit being exported the electric charge corresponding with light quantity
Camera head.
Background technology
In the past, as the image sensor for camera heads such as digital cameras (digital camera), it is commonly known that have
CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductors (CMOS)) image sensor
Or CCD (Charge Coupled Device, charge-coupled image sensor) image sensor.
In CMOS, typically every circuit can be exported the electric charge corresponding with light quantity, so at every circuit
Middle exposure beginning little by little offsets opportunity.Therefore, in the case of as subject with high-speed mobile, produce photographed images
In subject produce distortion so-called Rolling shutter (rolling shutter) phenomenon.
In order to suppress this kind of Rolling shutter phenomenon, it is commonly known that there is use liquid crystal shutter will be incident to CMOS
The method (for example, referring to patent documentation 1) that covers of light.
[background technology document]
[patent documentation]
[patent documentation 1] International Publication the 2008/004302nd
Summary of the invention
[inventing problem to be solved]
As it has been described above, pass through and use liquid crystal shutter, even if in the case of using CMOS, it is possible to suppression
The generation of the distortion of subject.But, in camera head, it is desirable to make the distortion of subject disappear, and make subject
Do not shoot with not rocking.Especially, in the case of shooting is wider with the object of high-speed mobile or the visual angle of camera head, shooting
Subject in image easily produces and rocks, and subject is undistorted and suppression shoots with rocking to be preferably able to make this kind.
In view of described problem, it is an object of the invention to provide a kind of distortion that can suppress subject and suppress being shot simultaneously
The camera head rocked of body.
[solving the technological means of problem]
The principle aspect of the present invention relates to a kind of camera head.The camera head of this aspect includes: liquid crystal shutter, because of voltage
Apply and transmitance minimizing；Image sensor, the electric charge corresponding with light light quantity to every circuit accumulation and output；Lens,
Make the light sensitive surface imaging at described image sensor of target area；Shutter control portion, carries out opening of described liquid crystal shutter
Close control；And image sensor control portion, control described image sensor.Described liquid crystal shutter passes relative to described image
Sensor is arranged in side, described target area.Described image sensor control portion is with in each circuit on described image sensor
The mode that a part during charge accumulation coincides with one another controls described image sensor, and described shutter control portion is with about institute
Have that described circuit coincides with one another during charge accumulation repeat accumulation during in the mode control that exposes of described image sensor
Make described liquid crystal shutter.
According to the camera head of this aspect, due to image sensor exposure middle during repeating accumulation, so to all circuits,
In identical opportunity and period, irradiate the light of target area.Therefore, even if in the case of subject is with high-speed mobile, quilt
The photographed images taking the photograph body also will not produce distortion.It addition, it is maximum for using the transmitance when no applied voltage,
The liquid crystal shutter of the so-called the whitest mode of transmitance step-down in the case of applying voltage.Thus, can be by the exposure of liquid crystal shutter
Period suppresses less, thus can suppress rocking of the subject in photographed images.
The camera head of this aspect may be configured as the temperature sensor possessing the peripheral temperature obtaining described liquid crystal shutter.Described
Shutter control portion may be configured as, according to described peripheral temperature, controlling the operating period of described liquid crystal shutter.Then, can basis
By the change of the light transmission rate of the liquid crystal shutter caused by the change of peripheral temperature, adjust and be taken into image sensor
Light quantity.Thus, the photographed images of suitable brightness can be obtained.
At the camera head of this aspect, described shutter control portion may be configured as according to described peripheral temperature, makes described liquid crystal fast
The liminal value change of the described operating period of door.Then, the operating period of the shutter becoming deficiency in light quantity it is particularly susceptible
Liminal value be adjusted, so the photographed images of more appropriate brightness can be obtained.
In the case, described shutter control portion may be configured as the brightness according to subject, at described liminal value to
Automatically adjust the described operating period of described liquid crystal shutter between high limit value, and according to described peripheral temperature, make described in
The set point change of low ultimate value.Then, even if in the case of the operating period of shutter is automatically adjusted based on the feedback signal, also according to by
The change of the light transmission rate of the liquid crystal shutter caused by the change of peripheral temperature, adjusts operating period minimum of shutter
Ultimate value.Therefore, by the automatic adjustment of the operating period of shutter, photographed images can be avoided dimmed.
In the camera head of this aspect, described shutter control portion may be configured as in described peripheral temperature less than specific threshold value
In the case of temperature, the liminal value of the described operating period of described liquid crystal shutter is set as high with described peripheral temperature
Situation in described threshold temperature compares bigger value.Then, the temperature that the minimizing amplitude of especially transmitance is bigger can be prevented
The deficiency in light quantity of image sensor during reduction.
In the camera head of this aspect, described image sensor may be configured as the high speed readout with output signal at high speed
The function of pattern, described image sensor control portion is by being set as described height to the control model of described image sensor
Fast reading exit pattern, and produce described repeat accumulation during.
According to the camera head of this aspect, owing to using the distortion of high speed readout mode suppression photographed images, so can one side
The frame transfer rate of photographed images, one side is maintained to suppress the distortion of subject.
[effect of invention]
As previously discussed, according to the present invention, it is possible to provide a kind of distortion that can suppress subject and simultaneously suppression subject
The camera head rocked.
The effect of the present invention or meaning can be more than you know according to the explanation of embodiment shown below.
But, embodiment shown below is only for by illustration during present invention enforcement, and the present invention is not subject to
The following any restriction of the content described in embodiment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the composition of the camera head representing embodiment.
Fig. 2 is the figure of the composition of the CMOS representing embodiment.
Fig. 3 (a), (b) are the figures of the control method of the CMOS that embodiment is described.
Fig. 4 (a)～(d) are the figures of the light transmission rate of the liquid crystal shutter of the characteristic with the whitest mode representing embodiment,
Schematically show the figure of the photographed images of the situation of the liquid crystal shutter using the characteristic with the whitest mode, will have normally-black
The figure that the light transmission rate of the liquid crystal shutter of the characteristic of mode represents as comparative example, has the characteristic of normally-black mode by use
The figure that schematically shows as comparative example of the photographed images of situation of liquid crystal shutter.
Fig. 5 is the flow chart of the control of the liquid crystal shutter representing embodiment.
Fig. 6 (a)～(d) are the figures of the light transmission rate of the liquid crystal shutter representing modification 1 and schematically show photographed images
The figure of state.
With the exposure during low temperature when Fig. 7 (a)～(c) are flow chart and the explanation room temperature of the control of the liquid crystal shutter representing modification 1
The figure of the establishing method of the liminal value during light.
Fig. 8 (a), (b) be in the high speed readout pattern that modification 2 is described repeat accumulation during production method and exposure period
Between the figure of establishing method.
Detailed description of the invention
Hereinafter, referring to the drawings embodiments of the present invention are illustrated.
Fig. 1 is the schematic diagram of the composition representing camera head 1.
Camera head 1 possesses lens 10, aperture 20, liquid crystal shutter 30, CMOS 40, temperature sensing
Device 50 and control portion 60.
Lens 10 are taken into the light from target area, make the picture sensitive surface in CMOS 40 of target area
Imaging.Aperture 20 limits from outside light in the way of consistent with the F numerical value of lens 10.Aperture 20 passes through aperture
Drive circuit 21, adjusts aperture amount.
Liquid crystal shutter 30 is maximum for having the transmitance when no applied voltage, if applying voltage, transmitance becomes
The liquid crystal shutter of the characteristic of so-called the whitest low mode.That is, liquid crystal shutter 30 makes light saturating when no applied voltage
Cross, under executing alive state, light is interdicted.The logical driving from liquid crystal shutter drive circuit 31 of liquid crystal shutter 30 is believed
Number, and switch the open and-shut mode of shutter.
The CMOS 40 position corresponding with each pixel on sensitive surface is respectively provided with photodiode.
CMOS 40 is controlled by camera signal processing circuit 41, and every circuit is carried out the electricity to photodiode
The accumulation of lotus and output.
Temperature sensor 50 possesses critesistor equitemperature detecting element, the temperature of the surrounding of detection liquid crystal shutter 30.Temperature
The signal corresponding with the temperature detected is exported to temperature sensing circuit 51 by degree sensor 50.Temperature sensing circuit 51
By the signal digitized corresponding with the temperature exported from temperature sensor 50 and export to control portion 60.
Control portion 60 possesses the storage parts 61 such as CPU (Central Processing Unit, central processing unit) and memorizer, and
According to each portion of the programme-control being held in storage part 61.Storage part 61, in addition to keeping the program controlled, is also made
It is utilized for the working region during control in control portion 60.
By being held in the program in storage part 61, control portion 60 is given image sensor control portion 62, shutter control
Portion 63 and the function of diaphragm control unit 64.
Image sensor control portion 62 is for carrying out CMOS 40 via camera signal processing circuit 41
The function part controlled.Shutter control portion 63 is for being controlled liquid crystal shutter 30 via liquid crystal shutter drive circuit 31
Function part.Diaphragm control unit 64 is the function part being controlled aperture 20 via aperture drive circuit 21.
Fig. 2 is the figure of the composition schematically showing CMOS 40.For convenience, Fig. 2 represents
The composition of the part corresponding with 9 pixels, but it practice, same is formed in longitudinal direction and transverse direction and specific picture
Prime pair is answered and is configured.
CMOS 40 has photodiode 40a in the position corresponding with each pixel.Photodiode 40a
If accepting light, then accumulate the electric charge corresponding with light light quantity.The electric charge accumulated is converted to voltage by amplifier 40b, and
Amplify.When switching 40c and connecting, exaggerated voltage is sent to vertical signal line 40d for every circuit L.Passed
The voltage sent is by the column circuits 40e temporary safe-keeping configured for every vertical signal line 40d.As column select switch 40f
During connection, the voltage taken care of is sent to horizontal signal lines 40g.Then, the electricity of horizontal signal lines 40g it is sent to
Pressure is sent to camera signal processing circuit 41.So, in CMOS 40, every circuit L is sent out
Send voltage signal.
It addition, every circuit L is controlled by CMOS 40, to carry out photodiode 40a's
The accumulation of electric charge.That is, the photodiode 40a on one circuit L was set as in specific period can the shape of accumulated charge
State, if process during this period, then exports produced electric charge in each photodiode 40a on this circuit L.This control is
Carry out successively to the circuit L of lowermost from the circuit L of uppermost.Circuit L be in can the state of accumulated charge time, if
Photodiode 40a on circuit L is irradiated light, then corresponding with the light quantity of the light irradiated electric charge can be accumulated in this line
Each photodiode 40a on road.So electric charge of accumulation is read for every circuit L as mentioned above, is converted to electricity
Pressure signal, output is to camera signal processing circuit 41.
Hereinafter, each circuit of being set as in CMOS 40 period of state of accumulated charge can be referred to as " electricity
During lotus accumulation ".It addition, liquid crystal shutter 30 is opened and CMOS 40 is irradiated the control period of light
It is referred to as " during exposure ".
And, it is referred to as " clapping by the interval that the accumulation that the same circuit in CMOS 40 makes electric charge starts
Take the photograph interval ".Additionally, be equivalent to " operating period " described in claims during Bao Guang.
Being back to Fig. 1, camera signal processing circuit 41 is with specific shooting interval, in CMOS 40
Each circuit set during charge accumulation, for every circuit, carry out the reading of electric charge.Camera signal processing circuit 41
Possess A/D (analog to digital, modulus) change-over circuit, will be via horizontal signal lines 40g (with reference to Fig. 2) from CMOS
The voltage signal of every circuit of image sensor 40 supply is converted to digital signal, and exports to control portion 60.Control
The portion 60 function by image sensor control portion 62, makes the digital signal from camera signal processing circuit 41 supply (bright
Degree signal) it is stored in storage part 61.So by all circuit amounts (1 frame amount) exported from camera signal processing circuit 41
Luminance signal constitutes 1 photographed images.
In present embodiment, the control model of CMOS 40 is set as that shooting interval is " lower than the most longer
Fast mode ".Such as, in low-speed mode, the shooting interval of each circuit be set as 60FPS (Frame Per Second, frame/
Second).
Fig. 3 (a) is the figure of the control schematically showing normal readout mode, and Fig. 3 (b) is to schematically show low-speed mode
The figure of control.In Fig. 3 (a), the left side of (b), it is schematically indicated the sensitive surface of CMOS 40 with
Each circuit L.Herein, the circuit L of uppermost is set to L0, the circuit of lowermost is set to Ln.It addition, Fig. 3 (a),
The right side of (b), it is schematically indicated control opportunity to each circuit.
With reference to Fig. 3 (a), in normal readout mode, to the control of the circuit L0 of uppermost opportunity T1 start, on opportunity
T2 terminates.To the control of the circuit L2 of lower 1 section than T1 on opportunity postpone only special time and start.So, whenever line
Road L will postpone special time the opportunity of starting when hypomere changes, carries out the control to each circuit successively simultaneously.Lowermost
The beginning of circuit Ln be opportunity to postpone the T2 on opportunity of Δ T from T1 on opportunity.
In the circuit L0 of uppermost, during opportunity, T1 set charge accumulation to opportunity between T2.Such as, from opportunity
Period Δ T between T1 to opportunity T2 be all set to charge accumulation during.To All other routes L, set similarly
During charge accumulation.From opportunity T1 through during opportunity of Δ T in T2, perform the electricity of the circuit L0 to uppermost
The reading of lotus.
About the circuit L1 of second segment, postponing the accumulation starting electric charge opportunity of specific time from T1 on opportunity, from
Opportunity, T2 postponed the reading performing electric charge opportunity of specific time.So, when circuit L changes, charge accumulation
Beginning just postpone special time opportunity, the execution that electric charge reads also postpones special time opportunity.Circuit Ln to lowermost
The beginning of charge accumulation become opportunity and to postpone the T2 on opportunity of Δ T from T1 on opportunity, electric charge reads execution become opportunity from
Opportunity, T2 postponed the T3 on opportunity of Δ T.
So, in normal readout mode, the end of the charge accumulation of the circuit L0 of uppermost is become opportunity under
The beginning opportunity of the charge accumulation of the circuit Ln of section.Therefore, in normal readout mode, the electricity of all circuits will not be produced
The period overlapped during lotus accumulation.
With reference to Fig. 3 (b), in low-speed mode, the reading to the electric charge of each circuit L postpones than normal readout mode opportunity, right
The beginning of the charge accumulation of each circuit L period to terminating, i.e. during charge accumulation, expansion is 2 times (2 Δ T).
Therefore, if control model is set as low-speed mode, then as shown in Fig. 3 (b), during producing the charge accumulation of all circuits
The period overlapped.Hereinafter, the period overlapped during the charge accumulation of the most all circuits is referred to as " during repeating accumulation ".
Be back to Fig. 1, liquid crystal shutter drive circuit 31 with in low-speed mode repeating accumulation during in specific opportunity,
By being exposed to the mode of the sensitive surface of CMOS 40 by the light of lens 10 optically focused, liquid crystal shutter 30 is made to open
Close.This control is carried out by the function in the shutter control portion 63 in control portion 60.Shutter control portion 63 makes liquid crystal shutter
Drive circuit 31 stops the voltage to liquid crystal shutter 30 and applies and opened by liquid crystal shutter 30, then, with time specific
Between width, again make liquid crystal shutter drive circuit 31 start the applying of voltage to liquid crystal shutter 30 and by liquid crystal shutter 30
Close.So, such as, as shown in Fig. 3 (b), repeat accumulation during in set expose during.
By so controlling liquid crystal shutter 30, and each circuit is irradiated the light from target area on identical opportunity.All
In photodiode 40a on circuit L, during identical opportunity and exposure, accumulated charge.Therefore, even if being shot
In the case of body is with high-speed mobile, the photographed images of subject also will not produce distortion.So, suppress Rolling shutter phenomenon,
Realize using global shutter (global shutter) function of CMOS 40.
And say, in camera head 1, it is desirable to make subject shoot without distortion, and make subject not shoot with not rocking.
Especially, in the case of shooting is with the subject of high-speed mobile or the visual angle of camera head wider in the case of, subject
Photographed images easily produces and rocks, it is desirable to the distortion of this kind of subject can be made to disappear and suppression shoots with rocking.
In general, rocking of the subject in photographed images can be suppressed by accelerating shutter speed.Herein, add quickly
Door speed is corresponding to making the operating period of liquid crystal shutter 30 shorten.By making the operating period of liquid crystal shutter 30 shorten, make
Shorten during exposure to CMOS 40, in the operating period of liquid crystal shutter 30, at CMOS shadow
Situation about significantly moving as the picture of subject on the sensitive surface of sensor 40 is inhibited.Thus, photographed images can be suppressed
In the rocking of subject.
In present embodiment, in order to suppress rocking of subject in photographed images, as it has been described above, as liquid crystal shutter 30,
It is maximum that use has the transmitance when no applied voltage, if applying voltage, the so-called Chang Baifang of transmitance step-down
The liquid crystal shutter of the characteristic of formula.
Fig. 4 (a) is the figure of the light transmission rate of the liquid crystal shutter representing the characteristic with the whitest mode, and Fig. 4 (c) is to represent tool
There is the figure of the light transmission rate of the liquid crystal shutter of the characteristic of normally-black mode.The liquid crystal shutter of normally-black mode is in no applied voltage
State under transmitance be minimum, if applying voltage, transmitance uprises.In Fig. 4 (a), (c), upper at light transmission rate
The driving signal (voltage) that liquid crystal shutter is applied by side remarks.
Liquid crystal shutter is according to the characteristic of liquid crystal, and applies the pace of change of transmitance during voltage with termination when applying voltage
Different.In general, in liquid crystal, the pace of change executing alive transmitance is very fast, but termination is executed alive
The pace of change crossing rate is slower.This is because, in the case of stopping to apply voltage, the pace of change of transmitance depends on
The viscosity of liquid crystal, the arrangement of liquid crystal is back to original direction and requires time for.
Utilizing the characteristic of such liquid crystal, such as, when no applied voltage, transmitance is relatively low, if applying voltage,
In the liquid crystal shutter of the normally-black mode of what is called that transmitance uprises, as shown in Fig. 4 (c), if starting to apply voltage, transmitance is fast
Short-term training is maximum, even if stopping to apply voltage, transmitance is not the most back to minima.Therefore, if using normally-black
The liquid crystal shutter of mode is as liquid crystal shutter 30, then to the time of exposure of CMOS 40 than intended length
Elongated, as shown in Fig. 4 (d), the photographed images of subject produces and rocks.
In contrast, transmitance is maximum when no applied voltage, if applying voltage, the what is called of transmitance step-down
In the liquid crystal shutter of the whitest mode, as shown in Fig. 4 (a), after interrupting applying voltage, transmitance becomes maximum lentamente,
If starting to apply voltage, then transmitance is quickly returned to minima.Therefore, if using the liquid crystal shutter conduct of the whitest mode
Liquid crystal shutter 30, then can be by suppressing shorter to the time of exposure of CMOS 40, as shown in Fig. 4 (b),
The photographed images that can effectively suppress subject produces situation about rocking.
As previously discussed, in the present embodiment, by the liquid crystal shutter of the whitest mode of use as liquid crystal shutter 30, and
The photographed images effectively suppressing subject produces situation about rocking.
In the present embodiment, brightness according to subject during the exposure shown in Fig. 3 (b), in maximum limit 1/TL
Automatically adjust between minimum limit value 1/TH.Herein, maximum limit 1/TL corresponds to minimum shutter speed, minimum
Ultimate value 1/TH corresponds to the highest shutter speed.Shutter speed is (to expose with the operating period of mark performance liquid crystal shutter 30
During light) speed.Herein, for convenience, the maximum limit during exposure and minimum limit value are with shutter speed
The form of expression (1/TL, 1/TH) represents.It addition, the brightness of subject is by owning in CMOS 40
Light light quantity detects.The brightness of subject, i.e. pass through to control to the amount of being taken into of the light of CMOS 40
Aperture 20 and suitably adjust.
Fig. 5 is the flow chart of the control representing liquid crystal shutter 30.This control is that control portion 60 is by shutter control portion 63
Function perform.
If shooting action starts, then control portion 60 is according to the brightness of photographed images, in maximum limit 1/TL to minimum pole
Between limit value 1/TH, set during exposure (S101).In Fig. 3 (b), for example, terminate opportunity during exposure and fix, root
Change on opportunity is started according to the length during exposure.Or, during exposure, alternatively the opportunity of starting is fixed, according to exposure period
Between length and terminate opportunity change.
Then, shutter control portion 63 starts liquid crystal shutter 30 is applied voltage, and liquid crystal shutter 30 is set to off shape
State (S102).Then, if the beginning arrival on opportunity during Bao Guang, then control portion 60 stops liquid crystal shutter 30 is applied electricity
Pressure (S104).So, liquid crystal shutter 30 is open, the imaging in CMOS 40 of the light of target area.
Then, if terminating (S105: yes) during the exposure set in S101, then control portion 60 starts again at liquid crystal fast
Door 30 applies voltage, closes liquid crystal shutter 30 (S106).Thus, CMOS 40 is occluded.Then,
Control portion 60 makes process be back to S103 (S107: no), waits the arrival starting opportunity during next exposure.So,
Repeat the control of S103～S106.Then, if shooting action terminates (S107: yes), then control portion 60 stops liquid crystal
Shutter 30 applies voltage, terminates the control to liquid crystal shutter 30.
Effect ＞ of ＜ embodiment
According to present embodiment, play following effect.
As shown in Fig. 3 (b), during setting exposure middle during repeating accumulation, so the photoelectricity on all circuit L
In diode 40a, accumulated charge during identical opportunity and exposure.Therefore, even if in subject with the feelings of high-speed mobile
Under condition, the photographed images of subject also will not produce distortion.
It addition, as shown in Fig. 4 (a), be maximum by the transmitance when no applied voltage, executing alive situation
The liquid crystal shutter of the so-called the whitest mode of lower transmitance step-down is used as liquid crystal shutter 30.Thus, can be by liquid crystal shutter 30
Suppress less during exposure, thus rocking of the subject in photographed images can be suppressed.
＜ modification 1 ＞
But, the light transmission rate of liquid crystal shutter 30 changes according to temperature.This is because, the viscosity of liquid crystal is according to temperature
Spend and change.
The figure of the light transmission rate of the liquid crystal shutter 30 when Fig. 6 (a) is to schematically show room temperature, Fig. 6 (b) is schematically
The figure of the light transmission rate of the liquid crystal shutter 30 during expression low temperature.
As shown in Fig. 6 (a), in the case of the peripheral temperature of liquid crystal shutter 30 is room temperature, stopping liquid crystal shutter 30
After the applying of voltage to the beginning of the applying of voltage during, it is thus achieved that the highest transmitance.Therefore, even if will
Minimum limit value 1/TH during exposure is set as less value, it is possible to obtain taking the photograph of suitable brightness as shown in Fig. 6 (c)
As image.
In contrast, in the case of the peripheral temperature of liquid crystal shutter 30 is low temperature, owing to the viscosity of liquid crystal increases, institute
The reaction of the liquid crystal shutter 30 when applying so that voltage is non-reduces.Therefore, the transmitance of the liquid crystal shutter 30 of the whitest mode is such as
Shown in Fig. 6 (b), the rate of climb of transmitance during termination applying voltage is slack-off.Therefore, if by the minimum pole during exposure
Limit value 1/TH is set as less value, then to the beginning of applying of voltage after stopping the applying of voltage of liquid crystal shutter 30
During till, light is taken into the most deficiently to CMOS 40.If so peripheral temperature step-down,
Then when minimum limit value 1/TH is set as less value, as shown in Fig. 6 (d), photographed images can be caused to become
Secretly.
Therefore, in modification 1, monitor the signal from the temperature sensor 50 shown in Fig. 1, when low temperature, to expose
The mode that minimum limit value 1/TH during light diminishes not too much controls liquid crystal shutter 30.
Fig. 7 (a) is the flow chart of the control of the liquid crystal shutter 30 representing modification 1.In the flow chart of Fig. 7 (a), at Fig. 5
Flow chart in, before the process of S101, added the process of S111～S114.
With reference to Fig. 7 (a), if shooting action starts, then to utilize temperature sensor 50 to obtain current liquid crystal fast in control portion 60
Peripheral temperature P (S111) of door 30.If acquired peripheral temperature P is below threshold temperature Psh (S112: yes), then
Minimum limit value 1/TH during the exposure of liquid crystal shutter 30 is set as more longer than normal value 1/THN by control portion 60
Expansion value 1/THL (S113).On the other hand, in the case of peripheral temperature P is higher than threshold temperature Psh (S112: no),
Minimum limit value 1/TH during the exposure of liquid crystal shutter 30 is set as normal value 1/THN (S114) by control portion 60.And
And, control portion 60 makes process advance to the S101 shown in Fig. 5, carries out shutter control in the same manner as described embodiment.
In this modification 1, such as, using the brightness of photographed images with the form that associates during exposure as room temperature use, depositing
Storage portion 61 only keeps one.In this form, the lower limit of the brightness of photographed images is set the maximum during exposure
Ultimate value 1/TL, sets minimum limit value 1/THN (normal value) during exposure to the higher limit of the brightness of photographed images.
It addition, between maximum limit 1/TL and minimum limit value 1/THN (normal value), just associate every specific brightness magnitude
During one exposure.In this form, exposure period 1/THL (expansion value) associates with specific brightness magnitude.
In the case of peripheral temperature P of liquid crystal shutter 30 exceedes threshold temperature Psh (S112: yes), during exposing
In setting, directly use and be maintained at the form in storage part 61.Therefore, minimum limit value 1/TH during exposure becomes
Normal value 1/THN (S114).On the other hand, peripheral temperature P at liquid crystal shutter 30 is the feelings of below threshold temperature Psh
Under condition (S112: no), the exposure period 1/THL in this form is set to minimum limit value, with this exposure period 1/THL
Corresponding brightness magnitude more than brightness magnitude all applies exposure period 1/THL.Therefore, the least limit during exposure
Value 1/TH becomes expansion value 1/THL (S113).In the case of peripheral temperature P is below threshold temperature Psh, use this
The form that sample reconstitutes, during exposure when setting actual photographed.
Additionally, herein, form when using the form of room temperature to reconstitute low temperature, but also can by the form of room temperature with
Form during low temperature is individually stored in storage part 61.In the case, the minimum pole during the exposure of the form of room temperature
Limit value is 1/THN (normal value), and the minimum limit value during the exposure of form during low temperature is 1/THL (expansion value).This
Outward, in the form when the form of room temperature is with low temperature, the brightness magnitude of the photographed images during being associated with each exposure also may be used
Different.
It addition, room temperature with the low temperature used time, it is possible to respectively by during the lower limit of the brightness of photographed images and exposure
The combination of minimum limit value 1/TH during the higher limit of the combination of big ultimate value 1/TL and the brightness of photographed images and exposure
It is stored in storage part 61, these values are applied to specific arithmetic expression, calculate and the brightness of photographed images during actual photographed
During corresponding exposure.
Effect ＞ of ＜ modification 1
Fig. 7 (b) is the figure of the light transmission rate of the liquid crystal shutter 30 during the room temperature schematically showing modification 1.Fig. 7 (c)
It it is the figure of the light transmission rate of liquid crystal shutter 30 during the low temperature schematically showing modification 1.
As shown in Fig. 7 (c), when low temperature, minimum limit value 1/TH during the exposure that will be applied to liquid crystal shutter 30 sets
It is set to expansion value 1/THL more longer than normal value 1/THN, so compared with the situation of Fig. 6 (b), in the applying of voltage
Only the period to the starting again of applying is elongated.Therefore, as shown in Fig. 7 (c), the transmitance of liquid crystal shutter 30 can be made to fill
Divide and rise, thus an adequate amount of light is taken into CMOS 40.Thus, photographed images can be avoided dimmed.
It addition, as shown in Fig. 7 (b), when room temperature, minimum limit value 1/TH is set as normal value 1/THN.Therefore, with
Described embodiment is identical, even if subject as with high-speed mobile on the sensitive surface of CMOS 40
In the case of, it is possible to effectively suppress what the photographed images of subject produced to rock.
＜ modification 2 ＞
In described embodiment and modification 1, the control model of CMOS 40 is set as low-speed mode,
But in this modification 2, the control model of CMOS 40 is set as high speed readout pattern.That is, this change
In more example 2, using can the CMOS 40 of setting high-speed readout mode and camera signal processing circuit 41.
Fig. 8 (b) is the figure of the control schematically showing high speed readout pattern.For convenience, Fig. 8 (a) illustrates show
Meaning property ground represents the figure of the control of normal readout mode.
In high speed readout pattern, by improving the reading speed of the electric charge to each circuit L, compared with normal readout mode,
The side-play amount shortening controlling beginning opportunity between circuit L.In the example of Fig. 8 (b), between circuit L, control the inclined of beginning opportunity
Shifting amount is reduced to half compared with normal readout mode.Therefore, the beginning to the control of the circuit Ln of lowermost stops opportunity
The beginning T1 on opportunity staying the control from the circuit L0 to uppermost postpones Δ T.
Reading speed to the electric charge of each circuit L, when being by making the charge signal specimen of each circuit (A/D conversion)
Bit number is fewer than bit number during normal control mode and realizes high speed.According to the image sensor control portion shown in Fig. 1
The control of 62, this process is to be carried out by camera signal processing circuit 41.In high speed readout pattern, owing to so cutting down mark
This change bit number, so compared with normal readout mode, the image quality of photographed images is somewhat deteriorated.But, this variation
Degree, in monitoring the purposes such as camera, there is no special problem for visibility.
So, by the control model of CMOS 40 being set as high speed readout pattern, such as Fig. 8 (b)
Shown in, coincide with one another during producing the charge accumulation of all circuits repeat accumulation during, can this repeat accumulation during set
During fixed exposure.And, during so setting exposure, each circuit L was irradiated from target area on identical opportunity
Light, in the photodiode 40a on all circuit L identical opportunity and exposure during accumulated charge.Therefore, originally
In modification 2, it is possible to suppress the photographed images of the subject with high-speed mobile to produce distortion.That is, logical as shown in Fig. 8 (b)
During crossing setting exposure, and suppress Rolling shutter phenomenon, it is achieved use the global shutter merit of CMOS 40
Energy.
Effect ＞ of ＜ modification 2
In the case of modification 2, owing to using the distortion of high speed readout mode suppression photographed images, so will not be as institute
The frame transfer rate stating the same photographed images of embodiment reduces.In said embodiment, owing to using low-speed mode, institute
With as shown in Fig. 3 (a), (b), shooting interval becomes 2 Δ T, and the frame transfer rate of photographed images becomes the one of normal readout mode
Half.In contrast, in modification 2, owing to using high speed readout pattern, so as shown in Fig. 8 (a), (b), between shooting
Every maintaining Δ T, the frame transfer rate of photographed images can be maintained equal with normal readout mode.So, according to this change
Example 2, can simultaneously maintain the frame transfer rate of photographed images, one side to suppress the distortion of subject.
Above, embodiments of the present invention and modification are illustrated, but the present invention not by described embodiment and
Any restriction of modification, it addition, embodiments of the present invention also can carry out the various changes beyond described.
Such as, in said embodiment, can be in maximum limit 1/TL to minimum limit value 1/TH during exposure
In the range of the mode of change, arrange in order to change the function of shutter speed, but also can be not provided with the change function of shutter speed.
In the case, by using the liquid crystal shutter 30 of the whitest mode, it is possible to the period that suppression shutter is open, thus can be effective
Rocking of ground suppression subject.
It addition, in described modification 1, peripheral temperature P at liquid crystal shutter 30 is the situation of below threshold temperature Psh
Under, minimum limit value 1/TH during exposure is set as expansion value 1/THL more longer than normal value 1/THN, but with
The change of minimum limit value 1/TH that peripheral temperature P of liquid crystal shutter 30 is corresponding processes and is not limited to this.Such as,
Little ultimate value 1/TH is changed to more than 3 sections also dependent on temperature, or, it is possible to change linearly according to temperature.
In the case of minimum limit value 1/TH is changed to multistage according to temperature, certain temperature range and this temperature range will be store
The management table of the value of interior preferable minimum limit value 1/TH is maintained at storage part 61, and sets and comprise liquid crystal shutter 30
Minimum limit value 1/TH corresponding to the temperature range of peripheral temperature.It addition, also dependent on can be by temperature and minimum limit value
The calculation process of the function of the value conversion of 1/TH, sets minimum limit value 1/TH.
It addition, in described modification 1, as shown in Fig. 7 (a), when the beginning of shooting action, set according to peripheral temperature P
Determine minimum limit value 1/TH, but also can obtain peripheral temperature P at any time in the period that shooting action continues, reset minimum pole
Limit value 1/TH.
It addition, to during the charge accumulation of each circuit in Fig. 3 (b), it is possible to be not set as all periods of 2 Δ T, it addition,
In Fig. 8 (b), it is possible to be not set as all periods of Δ T.As long as to during the charge accumulation of each circuit to produce repetition
Mode during accumulation sets.
It addition, liquid crystal shutter 30 can also be configured between lens 10 and aperture 20, or, it is possible to it is arranged in and compares lens
10 more by side, target area.Do not carry out temperature controlled in the case of, can be by temperature sensor 50 and temperature sensing circuit
51 omit from the composition of Fig. 1.
Additionally, embodiments of the present invention suitably can carry out various in the range of the technical thought shown in claims
Change.
[explanation of symbol]
1 camera head
10 lens
30 liquid crystal shutters
40 CMOS
50 temperature sensors
60 control portions
62 image sensor control portions
63 shutter control portions
Claims (7)
1. a camera head, it is characterised in that including:
Liquid crystal shutter, because voltage applies, transmitance reduces；
Image sensor, the electric charge corresponding with light light quantity to every circuit accumulation and output；
Lens, make the light sensitive surface imaging at described image sensor of target area；
Shutter control portion, carries out the open and close controlling of described liquid crystal shutter；And
Image sensor control portion, controls described image sensor；And
Described liquid crystal shutter is arranged in side, described target area relative to described image sensor,
Described image sensor control portion during the charge accumulation in each circuit on described image sensor one
The mode that part coincides with one another controls described image sensor,
Described shutter control portion with all described circuits coincide with one another during charge accumulation repeat accumulation during in
The mode of described image sensor exposure controls described liquid crystal shutter.
Camera head the most according to claim 1, it is characterised in that:
Possess the temperature sensor of the peripheral temperature obtaining described liquid crystal shutter,
Described shutter control portion, according to described peripheral temperature, controls the operating period of described liquid crystal shutter.
Camera head the most according to claim 2, it is characterised in that:
Described shutter control portion, according to described peripheral temperature, makes the minimum pole of the described operating period of described liquid crystal shutter
Limit value changes.
Camera head the most according to claim 3, it is characterised in that:
Described shutter control portion is according to the brightness of subject, between described liminal value to Up limit automatically
Adjust the described operating period of described liquid crystal shutter, and according to described peripheral temperature, make setting of described liminal value
Definite value changes.
Camera head the most according to claim 3, it is characterised in that:
Described shutter control portion is in the case of described peripheral temperature is less than specific threshold temperature, by fast for described liquid crystal
The liminal value of described operating period of door is set as with described peripheral temperature higher than the situation of described threshold temperature
Compare bigger value.
Camera head the most according to claim 4, it is characterised in that:
Described shutter control portion is in the case of described peripheral temperature is less than specific threshold temperature, by fast for described liquid crystal
The liminal value of described operating period of door is set as with described peripheral temperature higher than the situation of described threshold temperature
Compare bigger value.
Camera head the most according to any one of claim 1 to 6, it is characterised in that:
Described image sensor has the function of the high speed readout pattern of output signal at high speed,
Described image sensor control portion is by being set as described high speed to the control model of described image sensor
Readout mode, and produce described repeat accumulation during.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-195789 | 2014-09-25 | ||
| JP2014195789A JP2016066959A (en) | 2014-09-25 | 2014-09-25 | Imaging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106210459A true CN106210459A (en) | 2016-12-07 |
Family
ID=55799820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510450653.4A Withdrawn CN106210459A (en) | 2014-09-25 | 2015-07-28 | Camera head |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2016066959A (en) |
| KR (1) | KR20160036647A (en) |
| CN (1) | CN106210459A (en) |
| TW (1) | TW201613340A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509441A (en) * | 2018-11-20 | 2019-03-22 | 深圳市恩兴实业有限公司 | Dim imaging method, apparatus and system |
| CN109525765A (en) * | 2018-12-21 | 2019-03-26 | 浙江晶鲸科技有限公司 | High-speed image acquisition system and image-pickup method with FLC Light Valve |
| CN109756651A (en) * | 2017-11-01 | 2019-05-14 | 浙江舜宇智能光学技术有限公司 | Low temperature environment high-speed camera equipment and its imaging method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7109729B2 (en) * | 2018-02-07 | 2022-08-01 | 株式会社エビデント | Endoscope device, control method for endoscope device, control program for endoscope device, and recording medium |
| JP7336889B2 (en) | 2019-06-21 | 2023-09-01 | キヤノン株式会社 | IMAGING DEVICE, CONTROL METHOD AND PROGRAM |
| US11765472B2 (en) * | 2021-08-31 | 2023-09-19 | Zebra Technologies Corporation | Devices, system, and methods using transflective mirrors with rolling shutter sensors |
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| CN2430715Y (en) * | 2000-05-19 | 2001-05-16 | 林明彦 | 3D electronic liquid crystal shutter glasses with high shading rate |
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| JP2012095176A (en) * | 2010-10-28 | 2012-05-17 | Sony Corp | Imaging apparatus, imaging method and program |
| JP5909997B2 (en) * | 2011-11-01 | 2016-04-27 | 株式会社リコー | IMAGING DEVICE AND IMAGING DEVICE CONTROL METHOD |
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2014
- 2014-09-25 JP JP2014195789A patent/JP2016066959A/en active Pending
-
2015
- 2015-05-12 TW TW104115086A patent/TW201613340A/en unknown
- 2015-07-28 CN CN201510450653.4A patent/CN106210459A/en not_active Withdrawn
- 2015-08-12 KR KR1020150113655A patent/KR20160036647A/en unknown
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| CN2430715Y (en) * | 2000-05-19 | 2001-05-16 | 林明彦 | 3D electronic liquid crystal shutter glasses with high shading rate |
| TW200805638A (en) * | 2006-07-07 | 2008-01-16 | Fujitsu Ltd | Solid-state imaging device and method of controlling the same |
| CN102655567A (en) * | 2011-03-02 | 2012-09-05 | 奥林巴斯映像株式会社 | Electronic photography device |
| CN103777392A (en) * | 2012-10-17 | 2014-05-07 | 三星电子株式会社 | Liquid crystal shutter and image capturing apparatus |
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| CN109756651A (en) * | 2017-11-01 | 2019-05-14 | 浙江舜宇智能光学技术有限公司 | Low temperature environment high-speed camera equipment and its imaging method |
| CN109509441A (en) * | 2018-11-20 | 2019-03-22 | 深圳市恩兴实业有限公司 | Dim imaging method, apparatus and system |
| CN109509441B (en) * | 2018-11-20 | 2021-02-19 | 深圳市恩兴实业有限公司 | Dimming imaging method, device and system |
| CN109525765A (en) * | 2018-12-21 | 2019-03-26 | 浙江晶鲸科技有限公司 | High-speed image acquisition system and image-pickup method with FLC Light Valve |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201613340A (en) | 2016-04-01 |
| JP2016066959A (en) | 2016-04-28 |
| KR20160036647A (en) | 2016-04-04 |
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Application publication date: 20161207 |