JPH0748825B2 - Imaging device with electronic telephoto - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic telephoto imaging device using a CCD (charge coupled device) image sensor, for example, a video camera or a video movie (camera integrated video). Used.

(Prior Art) An example of a conventional electronic telephoto imaging device is shown in FIG.

In the figure, 31 is a timing pulse generation circuit (hereinafter referred to as a timing IC) that generates a timing pulse for driving the CCD image sensor 36, 32 is a vertical transfer pulse selector, 33 is a vertical transfer driver, and 34 is a horizontal transfer driver. Selector for transfer pulse and reset pulse, 35 horizontal transfer and reset driver, 37 S / H (sample and hold) amplifier, 38 clock (CLK) selector, 39 S for color separation
/ H color separation pulse (SP: sampling pulse)
Is a selector for. Further, the timing IC 31 is supplied with the frequency of 2F _CK from the crystal oscillator 40 as a reference clock source.

The vertical transfer pulse selector 32 has the structure shown in FIG. That is, it is composed of the selectors 32a and 32b. Then, the select signal at the time of standard shooting is set to the “L” level, the select signal at the time of electronic telephoto shooting is set to the “H” level, and the logic of each selector 32a, 32b is input to the output Y when the select signal is at the “L” level. When A is selected and the select signal is at "H" level, the input B is selected as the output Y. Therefore, during standard shooting, the selector 32
The input A is selected as the output Y of a and becomes the “L” level,
As a result, the input Y is selected as the output Y of the selector 32b and the vertical transfer pulse is output as it is. On the other hand, during electronic telephoto shooting, input B is selected for output Y of selector 32a and F
_H / 2 pulse is output. Where F _H / 2 pulse is 2H
Period (H: 1 horizontal scanning period) pulse, "L" every 1H
A signal that repeats the level and the “H” level.
Therefore, the output Y of the selector 32b is input A every 1H.
And input B (fixed at "H" level or "L" level) are switched, and as a result, a vertical transfer pulse is output every 2H.

The horizontal transfer pulse and reset pulse selector 34,
The CLK selector 38 and the SP selector 39 have the configuration shown in FIG. That is, 1/2 divider 41 and selector 4
It consists of two. And at the time of standard shooting, selector 4
Input A is selected for output Y of 2 and each pulse is output as it is. On the other hand, during electronic telephoto shooting, the input B is selected as the output Y of the selector 42, and the input pulse is halved by the 1/2 frequency divider 41.
The divided one is output. As a result, the horizontal transfer is performed at twice the cycle of the standard shooting, and the vertical transfer is performed once every 2H, so that the area at the corner 1/4 of the display screen is doubled (four times the area). It is possible to obtain an expanded signal.

This timing relationship will be described with reference to FIGS. 14 to 16.

FIG. 14 shows the timing of the horizontal transfer pulse, and FIGS. 14 (a) and 14 (b) show the horizontal transfer pulse (H ₁ ),
(H ₂ ), the same figure (c) is the reset pulse (R), the same figure (d) is the output (VO) of the CCD image sensor 36, and the same figure (e) is the clock (CLK) for the S / H amplifier 37. , Fig. (F)
Is a clamping pulse (CDS) created in S / H amplifier 37 in synchronization with the rising edge of CLK.
S / H pulse (S / H) created in synchronism with the falling edge of S, the figure (h) is the output (Preout) of the S / H amplifier 37, and the figures (i) and (j) are color separation S / H pulse (SP ₁ ), (SP ₂ )
Is shown. Here, one cycle of the H ₁ pulse corresponds to one horizontal pixel cycle of the CCD image sensor 36. Further, since the output VO of the CCD image sensor 36 includes a clock component consisting of a reset component and a field through component in addition to the signal component, after clamping the field through component, the signal component is sampled and held,
Signal components with low low-frequency distortion and good S / N are separated and extracted. Also, since the signal component of VO is output with a negative polarity,
The one that reverses the polarity with an inverting amplifier and corrects it to the positive polarity is Preo
ut.

During electronic telephoto shooting, each pulse of these horizontal transfer systems has a cycle twice as long as that during standard shooting. As a result, the information for one horizontal line is read over the time of 2H,
Seen in, the signal becomes a signal that is doubled in the horizontal direction.

FIG. 15 shows the timing relationship in the vicinity of vertical blanking of the vertical transfer system pulse at the time of standard imaging. That is, FIG. 7A shows a vertical drive pulse (V
D), the same figure (b) is a horizontal drive pulse (HD), the same figure (c) is a vertical transfer pulse (typically V ₁ ), the same figure (d).
Is a read pulse (TG). However, VD and HD are SS
It is created by _{dividing FCK} by G (synchronization signal generation circuit).

During standard shooting, once every 1H during the vertical blanking period, HD
Vertical transfer is performed in synchronization with. Further, reading is also performed during the vertical blanking period, and is performed once every 1V (one vertical scanning period).

FIG. 16 shows the timing relationship near the vertical blanking of the vertical transfer system pulse during electronic telephoto photography. That is, FIG. 7A shows a vertical drive pulse (V
D), the same figure (b) is a horizontal drive pulse (HD), the same figure (c) is a vertical transfer pulse (typically V ₁ ), the same figure (d).
Is a read pulse (TG).

During electronic telephoto shooting, vertical transfer is normally performed once every 2H. Therefore, the information of all the horizontal lines is read out over a time period of 2V, and a signal that is doubled vertically is obtained when viewed at 1V.

FIG. 17 shows the timing relationship in the vicinity of HD during standard shooting, and FIG. 18 shows the timing relationship in the vicinity of HD during electronic telephoto shooting. That is, FIGS. 17 (a) and 18 (a) are horizontal drive pulses (HD), FIGS. 17 (b), (c), 18 (b), (c).
Is the horizontal transfer pulse (H ₁ ), (H ₂ ), Fig. 17 (d), 18
Figure (d) shows the optical black clamp pulse (OBC
P). OBCP is output from SSG and input to an OB clamp circuit (not shown) in the signal processing circuit. In addition, the horizontal transfer pulses H ₁ and H ₂ are shown in FIG.
As shown in (c), FIG. 18 (b), and (c), there is a pause period (H-BLK), and a vertical transfer pulse is input during this period to perform vertical transfer. Since OB (optical black) has about 30 last pixels in the horizontal pixels, the OBCP aiming at this is clamped and used as the black reference level (pedestal level) for signal processing.

Here, consider the assembly of a signal as a video signal.

In the horizontal direction, 1H of 2H is an unnecessary signal, and in the vertical direction, 1V of 2V is an unnecessary signal. Therefore, in the horizontal direction, a continuous signal is obtained by interpolating the time of the unnecessary signal with the necessary signal delayed by 1H by the 1H delay circuit and the analog switch. In the vertical direction, the charges for unnecessary signals are erased by using high-speed vertical transfer during the vertical blanking period. In addition, high-speed vertical transfer is a continuous vertical transfer of reverse feed,
This is a method of sweeping unnecessary charges to an overflow drain (not shown) provided in the D image sensor 36. This method is a method often used when sweeping out unnecessary charges in a high-speed electronic shutter.

FIG. 19 shows the timing of the normal forward vertical transfer pulse, and FIG. 20 shows the timing of the reverse vertical transfer pulse. Electric charges are accumulated in the vertical register during the period when the vertical transfer pulse is at the “L” level (actually, since the vertical transfer driver 33 inverts the electric charges, φV ₁ , φV ₂ , φV applied to the CCD image sensor 36). _3, a period in which considering in .phi.V ₄ becomes "H" level). In the case of FIG. 19, first, charges are stored under the electrodes of V ₂ and V ₃ . Then, [V ₂ , V ₃ ] →
[V ₂ , V ₃ , V ₄ ] → [V ₃ , V ₄ ] → [V ₃ , V ₄ , V ₁ ] → [V ₄ , V ₁ ] →
[V ₄ , V ₁ , V ₂ ] → [V ₁ , V ₂ ] → [V ₁ , V ₂ , V ₃ ] → [V ₂ , V ₃ ] The part of "L" level moves in order. This completes the forward transfer for one horizontal line. In the case of FIG. 20, [V ₂ , V ₃ ] → [V ₁ , V ₂ , V ₃ ] → [V ₁ , V ₂ ] → [V ₄ , V
₁ , V ₂ ] → [V ₄ , V ₁ ] → [V ₃ , V ₄ , V ₁ ] → [V ₃ , V ₄ ] → [V ₂ , V
The backward feed transfer for one horizontal line is completed by moving the portion at the “L” level in the order of ₃ , V ₄ ] → [V ₂ , V ₃ ]. With the method described above, it is possible to perform double enlargement both horizontally and vertically.

Here, reading will be described.

In the CCD image sensor 36 having the complementary color filter array configuration as shown in FIG. 21, as shown in FIG. 22, the photodiodes 50a, 50a ... Corresponding to one-to-one have vertical registers 51a, 51a.
Are arranged with respect to each other and are vertically adjacent to each other, for example, V ₁
A composite of two photodiodes 50a, the charge stored in the 50a of the photodiode 50a corresponding to the photodiode 50a and V ₃ corresponding to becomes the one pixel of the charge of one horizontal line. Reading is performed by applying a reading pulse TG to a gate (reading gate) 52a connecting the photodiode 50a and the vertical register 51a. Further, the combination of the photodiodes 50a for reading differs between the odd field and the even field. This causes interlacing (see Figure 23).

FIG. 24 shows the read timing of the odd field, and FIG. 25 shows the read timing of the even field.

In the odd-numbered field, first, the charge accumulated in the photodiode corresponding to V ₃ is read by setting TG to the “L” level, and is stored in the registers below the electrodes of V ₂ and V ₃ . Next, [V ₂ , V ₃ ] → [V ₁ , V ₂ , V ₃ ] → [V ₁ , V ₂ ] → [V ₄ , V ₁ ,
Move the "L" level part in the order of V ₂ ] → [V ₄ , V ₁ ],
Reverse feed transfer for 0.5 horizontal lines is performed, and the charges read from the photodiode corresponding to V ₃ are stored in the registers below the electrodes of V ₄ and V ₁ . Then the charge stored in the photodiode corresponding to V ₁ is read out in the same way,
It is stored in a register under the electrodes of V ₄ and V ₁ . As a result,
The charge read from the photodiode corresponding to V ₁ , and
The charges read from the photodiode corresponding to V ₃ are mixed. After that, [V ₄ , V ₁ ] → [V ₄ , V ₁ , V ₂ ] → [V ₁ ,
Move the "L" level part in the order of V ₂ ] → [V ₁ , V ₂ , V ₃ ] → [V ₂ , V ₃ ] and perform forward transfer for 0.5 horizontal lines to obtain V
_The charges read from the photodiodes corresponding to ₁ and V ₃ are stored in the registers under the electrodes of V ₂ and V ₃ .

In the even field, the charge read from the photodiode corresponding to V ₃ is [V ₂ , V ₃ ] → [V ₂ , V ₃ ,
V ₄ ] → [V ₃ , V ₄ ] → [V ₃ , V ₄ , V ₁ ] → [V ₄ , V ₁ ] in the order of horizontal 0.5 line forward transfer, under the electrodes of V ₄ and V ₁ . Stored in the register. Next, the charges read from the photodiode corresponding to V ₁ and the charges read from the photodiode corresponding to V ₃ are mixed, and [V ₄ , V ₁ ] → [V
_3, in V _4, V _1] → [V _3, V _4] → [V _2, V _3, V _4] → [V _2, V ₃ sequentially backward transfer horizontal 0.5 line of], V ₃ and The charges read from the photodiode corresponding to V ₁ are stored in the registers below the electrodes of V ₂ and V ₃ .

In this way, by performing the timing operation in the reading process, V ₁ and V ₃ in the case of odd fields, V ₃ and V ₁ in the case of even fields, and the respective combinations differ by 0.5 horizontal lines. Interlacing is done by this.

(Problems to be Solved by the Invention) However, the above-described conventional electronic telephoto imaging device has the following problems.

The electronic telephoto function doubles the area of the 1/4 corner area of the display screen (4 times the area), and the central part cannot be enlarged as in the case of optical enlargement. , Especially when shooting with the zoom, I felt something was wrong. Further, when the area of the upper left 1/4 area of the display screen is enlarged to double, as shown in FIG. 18, a horizontal transfer pause period (H-BLK)
Becomes longer, and this area [area indicated by diagonal lines in FIG. 26 (b)] is visible on the left side of the screen.

At the time of electronic telephoto, a signal interpolated by a 1H delay circuit or the like is used, so that, for example, in terms of a luminance signal, the same signal for two horizontal lines continues. Therefore, when the combination of photodiodes is changed between the odd field and the even field, the horizontal 1 of either field may be changed depending on the video signal.
Lines may appear to be extra, which causes jitter between fields, resulting in a very hard-to-see image.

Depending on the timing of the select signal for switching between the standard shooting and the electronic telephoto shooting, the video signal is switched from the middle, and the video signal is disturbed, resulting in an unsightly image.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an image pickup apparatus with an electronic telephoto function having a double electronic telephoto function using a CCD image sensor, wherein the CCD image sensor is used during electronic telephoto shooting. The pulse related to the horizontal transfer of the CCD image sensor has a period twice as long as that in the standard photographing, the means for outputting the pulse related to the vertical transfer of the CCD image sensor once every 2H, and the timing of the pulse related to the vertical transfer is 1H. Setting means for setting an arbitrary point of the video period, and two high-speed vertical transfer periods within the vertical blanking period, and an odd field between the first high-speed vertical transfer period and the next high-speed vertical transfer period. And a timing pulse generating means having a read pulse for reading to the vertical shift register with the same combination of photodiodes for both even fields. Those were. Here, the pulse related to horizontal transfer is a horizontal transfer pulse, a reset pulse, a drive pulse for peripheral circuits, etc., and the pulse related to vertical transfer is a vertical transfer pulse, a pulse for clamping the optical black portion, etc. Is.

Further, in order to improve the operability of the electronic telescopic image pickup device, a changing unit that can arbitrarily change the enlargement region set by the setting unit and a display unit that displays the enlargement region changed by the changing unit are provided. I have it.

Further, in order to accurately switch between standard shooting and electronic telephoto shooting, switching between standard shooting and electronic telephoto shooting is performed by a signal synchronized with the vertical drive pulse.

(Function) In electronic telephoto shooting, by making the horizontal transfer system pulse twice as long as in standard shooting, it takes 2H time to read out information for one horizontal line. The signal becomes twice as large as the above. In addition, the vertical transfer system pulse
By outputting once every 2H and setting the timing at an arbitrary point in the video period of 1H, the enlarged portion can be made an arbitrary area of the screen at the time of standard photographing. In this case, readout during electronic telephoto is performed by using the same combination of photodiodes in both the odd field and the even field to prevent the occurrence of jitter between fields.

Further, the enlargement area of the display screen can be arbitrarily changed, and the changed enlargement area is displayed by a display means such as an electronic viewfinder, whereby a trimming function with good operability can be provided.

Further, by switching between the standard shooting and the electronic telephoto shooting by the signal synchronized with the vertical drive pulse, the standard / telephoto is not switched from the middle of the video signal, and the video signal is not disturbed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram showing an embodiment of an electronic telescopic image pickup device corresponding to claim 1 of the present invention.

In the figure, 1 is a timing pulse generation circuit (hereinafter referred to as a timing IC) that generates a timing pulse for driving the CCD image sensor 6, 3 is a vertical transfer driver, 5 is a horizontal transfer and reset driver, and 8 is an S. / H
An amplifier, 9 is an OB (optical black) clamp circuit, and 10 is an oscillation circuit.

FIG. 2 shows the internal structure of the oscillator circuit 10. That is, crystal unit 11 and inverter (C-MOS gate) 1
2, a crystal oscillator circuit 13 composed of resistors R ₁ and R ₂ and capacitors C ₁ and C ₂ , a 1/2 divider 14 using a JK-flip-flop, a selector 15, and inverters 16 and 17 It consists of and. Here, assuming that the internal reference clock of the timing IC1 is F _CK , it is necessary to supply 2 F _CK as the reference clock source to the timing IC 1 during standard shooting, so the oscillation frequency of the crystal oscillator 11 should be 2 F _CK . use. That is, the oscillation frequency of the crystal oscillation circuit 13 is 2F _CK . Also,
The select signal at the time of standard shooting is set to the “L” level, the select signal at the time of electronic telephoto shooting is set to the “H” level, and when the select signal is at the “L” level, the input A is selected as the output Y of the selector 15 and the select signal is Input B to output Y when "H" level
Is selected.

Therefore, during standard shooting, the oscillation frequency of the crystal oscillation circuit 13
2F _CK is input to the terminal A of the selector 15 via the inverters 16 and 17. At this time, since the selector 15 is connected to the terminal A side, the oscillation frequency _2FCK is equal to the terminal A-Y of the selector 15.
After that, it is supplied to the timing IC1 and serves as a reference clock source.

On the other hand, during electronic telephoto shooting, the oscillation frequency of the crystal oscillation circuit 13 is 2F.
_CK is _divided into 1/2 by the 1/2 divider 14 and then input to the terminal B of the selector 15. At this time, since the selector 15 is connected to the terminal B side, the oscillation frequency FCK _divided by 1/2 is supplied to the timing IC1 via the terminal BY of the selector 15 and serves as a reference clock source. As a result, timing IC1
The internal reference clock becomes F _CK / 2, and the cycle of all pulse timings is doubled, so the cycle of horizontal transfer pulse, reset pulse, vertical transfer pulse, and drive pulse of peripheral circuits are all doubled. Become. A pulse (OBCP) for clamping the OB section is output from the timing IC1. Also, the reference clock output to the SSG (synchronization signal generator) is output as the reference clock source of the timing IC1 when the mode switching is "H" level, and 1 when the mode switching is "L" level. Output the one divided by two.
Therefore, the standard clock of SSG during standard shooting and electronic telephoto shooting is always F _CK .

Other configurations, that is, vertical transfer driver 3, horizontal transfer and reset driver 5, CCD image sensor 6, S / H
The amplifier 8 and the OB clamp circuit 9 are the same as those of the above-described conventional electronic telephoto imaging device.

FIG. 3 shows the timing relationship near the vertical blanking of the vertical transfer system pulse during electronic telephoto shooting, and FIG. 4 shows the timing relationship between the horizontal drive pulse (HD) and horizontal transfer system pulse during electronic telephoto shooting. Is shown.

3A is a vertical drive pulse (VD), FIG. 3B is a horizontal drive pulse (HD), FIG. 3C is a vertical transfer pulse (V ₁ as an example), and FIG. ) Is a read pulse (TG). Further, FIG. 4 (a) shows a horizontal drive pulse (HD), FIGS. 4 (b) and (c) show horizontal transfer pulses (H ₁ ) and (H ₂ ), and FIG. 4 (d) shows (OBCP). . In addition,
Since the concept of the horizontal transfer system pulse is the same as that of the conventional example, the description is omitted here.

As can be seen from FIGS. 3 and 4, the vertical transfer pulse V ₁
Is output once every 2H, and its timing is set to an arbitrary point (the center in this example) of the 1H video signal, which is an unnecessary signal, so that the required signal portion, that is, the portion to be enlarged can be seen during standard shooting. Can be the central area of the screen [see FIGS. 5 (a) and 5 (b)]. However, in order not to see the horizontal transfer pause period (H-BLK) on the screen,
It is necessary to limit the area that can be set.

Also, the high-speed vertical transfer period is set to 2 within the vertical blanking period.
There is a period, and reading is performed once between the first high-speed vertical transfer period and the next high-speed vertical transfer period.

To explain this process, first read and then CC
The charges accumulated in all the photodiodes of the D image sensor 6 are transferred to the corresponding vertical register. Next, when enlarging the area in the center of the screen, the upper area of the screen 1 /
In order to sweep out the charges accumulated in the vertical register corresponding to 4, the high-speed vertical transfer in the forward direction is performed by the number of stages of the vertical register. At this time, since the horizontal transfer is performed normally, the charge may exceed the allowable storage amount of the horizontal register. For this reason, it is expected that the overflowed charges will penetrate into the video period beyond the vertical blanking period. Therefore, the reading and the high-speed vertical transfer period are set to end early. That is, the read and high-speed vertical transfer periods are set at the timings shown in FIG. Then, during the video period, vertical transfer is performed once every normal 2H to obtain a signal in the central area of the screen.
Next, the charge accumulated in the vertical register corresponding to the lower 1/4 of the screen, which is the remaining unnecessary area, is swept out, so this also performs at least the remaining high-speed vertical transfer in the forward direction within the next vertical blanking period. Do only for minutes.

The timing pulse as described above is output from the timing IC1. The timing IC1 is switched by the select signal. When the select signal is at the "H" level, the electronic telephoto shooting mode in which each pulse is generated at the above-described timing is set, and when it is at the "L" level, the standard shooting mode is set.
The standard shooting mode is the same as that described in the related art.

Next, reading during electronic telephoto shooting will be described.

In the present embodiment, regarding reading during electronic telephoto shooting,
The combination of photodiodes depending on the field is not changed, and reading is performed by the same combination of photodiodes in both the odd field and the even field. In this way, by adopting the reading method without interlacing, a stable screen without jitter can be obtained.

FIG. 6 is a schematic block diagram showing an embodiment of an image pickup apparatus with an electronic telescope corresponding to claim 2.

In the figure, 1 is a timing IC that generates timing pulses for driving the CCD image sensor 6, 3 is a vertical transfer driver, 5 is a horizontal transfer and reset driver,
Reference numeral 8 is an S / H amplifier, 9 is an OB clamp circuit, and 10 is an oscillating circuit. These configurations are the same as those shown in FIG.

In this embodiment, in addition to the above configuration, a controller 11 such as a joystick for controlling from the outside, a control circuit 12 for creating data from the information of the controller 11, and a signal for displaying the enlarged range are generated. Window display signal generating circuit 13 and a signal combining circuit for superimposing the window display signal on the composite video signal
14 plus.

The controller 11 detects the position of an operation lever (not shown) and inputs an analog signal composed of a horizontal signal A _H and a vertical signal A _V to the control circuit 12. The control circuit 12 is
Upon receiving this analog signal, a control signal S ₁ for switching between electronic telephoto shooting and standard shooting is output to the timing IC ₁ and the window display signal generation circuit 13. Also, after converting the analog signal from the controller 11 into a digital signal, horizontal digital data H-DATA and vertical digital data V-DATA are created and output to the timing IC 1 and the window display signal generation circuit 13. To do. An area to be expanded is set based on this data (H-DATA, V-DATA), and a signal for displaying the expanded range is created. That is, in the timing IC1, the timing of the vertical transfer system pulse is created based on H-DATA, and the number of two high-speed vertical transfer stages is set based on V-DATA. Further, in the window display signal generating circuit 13, for example, FIGS.
When a range to be enlarged is displayed with a white frame (frame indicated by a dashed line in the drawing) as shown in, the timing of the vertical line is H-DA.
It is created based on TA, and the timing of the horizontal line is created based on V-DATA. However, as it is, # is displayed on the screen, so lines other than the window frame are deleted. The window display signal S ₂ thus created is output to the signal synthesis circuit 14, and the composite video signal S ₃ obtained by superimposing the window display signal on the composite video signal is output to the electronic viewfinder (not shown). . However, the window display signal S ₂ is output only during standard shooting, and stopped during electronic telephoto shooting to turn the display ON / OFF. With such a configuration, the angle of view can be freely changed only by operating the operation lever of the controller 11 such as the joystick. Therefore, the angle of view can be easily changed even after the imaging device is fixed to a tripod or the like, and a stable image can be obtained during zooming. Further, if an inclination detector (not shown) using a plurality of acceleration sensors is used instead of the controller 11, it is possible to configure an image pickup device with camera shake prevention.

FIG. 8 is a schematic block diagram showing an embodiment of an image pickup apparatus with an electronic telescope corresponding to claim 3.

In the figure, 1 is a timing IC that generates timing pulses for driving the CCD image sensor 6, 3 is a vertical transfer driver, 5 is a horizontal transfer and reset driver,
Reference numeral 8 is an S / H amplifier, 9 is an OB clamp circuit, and 10 is an oscillating circuit. These configurations are the same as those shown in FIG.

In the present embodiment, in addition to the above configuration, a changeover switch 16 for changing over between standard photographing and electronic telephoto photographing, and a changeover signal generating circuit for generating a changeover signal S ₅ synchronized with the VD pulse by operating this changeover switch 16. 17 is added.

FIG. 9 shows an example of the switching signal generating circuit 17. The changeover signal generation circuit 17 is composed of a D-flip-flop, a changeover switch signal S ₆ by the operation of the changeover switch 16 is inputted to the data input terminal (D), and a clock terminal (CK) is inputted.
VD pulse is input. In addition, the preset terminal (P
R) and clear terminal (CLR) are always at "H" level.

FIG. 10 is a timing chart showing the operation of the switching signal generating circuit 17. As shown in the figure, the changeover switch signal S ₆
Has a pulse waveform affected by chattering or the like. Therefore, when receiving the changeover switch signal S ₆ , the changeover signal S ₅ is output at the rising edge of the VD pulse.
As a result, the operation is performed such that the image disturbance due to chattering and the like, the image disturbance due to the switching in the middle of the screen, and the like are all removed, so that a very smooth switching operation can be performed.

(Effects of the Invention) As described above, the electronic telescopic image pickup device of the present invention has various effects as follows.

When shooting with electronic telephoto, the area of any 1/4 area of the screen during standard shooting can be doubled (4 times the area), and if the enlarged area is set in the center of the screen, for example, The same effect can be obtained as with the case of zooming in dynamically, and even when zoom is used together, it can be handled without discomfort.

Further, by reading out the odd field and the even field by the same combination of photodiodes, it is possible to obtain a stable image without jitter between fields.

Further, the enlarged area of the screen can be arbitrarily changed, and the changed area can be displayed on, for example, an electronic viewfinder, so that the enlarged area can be directly visually recognized and the screen can be smoothly enlarged.

Furthermore, by switching between the standard shooting and the electronic telephoto shooting by a signal synchronized with the vertical drive pulse, it is possible to prevent the occurrence of image distortion at the screen switching.

[Brief description of drawings]

1 to 5 show an embodiment of an electronic telescopic image pickup device corresponding to claim 1 of the present invention. FIG. 1 is a schematic block diagram of the electronic telescopic image pickup device, and FIG. FIG. 3 is an internal configuration diagram, FIG. 3 is a timing chart around blanking of a vertical transfer system pulse during electronic telephoto shooting, and FIG. 4 is a timing chart showing a relationship between a horizontal drive pulse and a horizontal transfer system pulse during electronic telephoto shooting. 5 (a), (b)
FIG. 6 is an enlarged view of a central portion of the screen, FIG. 6 is a schematic block diagram of an electronic telescopic image pickup device according to claim 2 of the present invention, and FIGS. 7A, 7B and 7C. , (D) are views showing a state in which the central portion of the screen and an arbitrary area are enlarged, FIG. 8 is a schematic block diagram of an electronic telescopic image pickup device corresponding to claim 3 of the present invention, and FIG. 9 is a switching signal. FIG. 10 is a timing chart showing an operation of a switching signal generating circuit, FIG. 11 is a schematic block diagram showing an example of a conventional electronic telescopic image pickup device, and FIG. 12 is a vertical transfer pulse. Fig. 13 shows the circuit configuration of the selector, Fig. 13 shows the circuit configuration of selectors other than the vertical transfer pulse selector, Fig. 14 shows the timing chart of the horizontal transfer system pulse, and Fig. 15 shows the vertical block of the vertical transfer system pulse during standard shooting. Timing chart near the ranking, Figure 16 is electronic Timing chart near vertical blanking of vertical transfer system pulse during shooting, Fig. 17 is a timing chart near HD during standard shooting, Fig. 18 is a timing chart near HD during electronic telephoto shooting, and Fig. 19 is forward feed FIG. 20 is a timing chart of the vertical transfer pulse of FIG. 20, FIG. 20 is a timing chart of the reverse transfer vertical transfer pulse, FIG. 21 is a diagram showing a complementary color filter array configuration of the CCD image sensor, FIG. 22 is an internal configuration diagram of the CCD image sensor, FIG. 23 is a diagram for explaining the interlacing method, FIG. 24 is a diagram showing read timing of odd fields, FIG. 25 is a diagram showing read timing of even fields, and FIGS. 26 (a) and 26 (b). FIG. 7 is a diagram showing a state in which an upper left 1/4 area of a screen is enlarged by a conventional device. 1 …… Timing pulse generation circuit (timing IC) 3 …… Vertical transfer driver 5 …… Horizontal transfer and reset driver 8 …… S / H amplifier, 9 …… OB clamp circuit 10 …… Oscillation circuit, 11 …… Controller 12 ...... Control circuit 13 ...... Window display signal generation circuit 14 ...... Signal synthesis circuit, 16 ...... Changeover switch 17 ...... Change signal generation circuit

Claims (3)

[Claims] 1. An image pickup apparatus with an electronic telephoto device having a double electronic telephoto function using a CCD image sensor, wherein a pulse related to horizontal transfer of the CCD image sensor is doubled during standard electronic photography during electronic telephoto shooting. A means for outputting the pulse related to the vertical transfer of the CCD image sensor once every 2H (H: horizontal scanning period) and the timing of the pulse related to the vertical transfer to any point in the video period of 1H. A combination of setting means for setting and two high-speed vertical transfer periods within the vertical blanking period, and the same photodiode in both the odd field and the even field between the first high-speed vertical transfer period and the next high-speed vertical transfer period And a timing pulse generating means having a read pulse for reading to a vertical shift register at apparatus. 2. The electronic telephoto device according to claim 1, further comprising: changing means capable of arbitrarily changing the enlarged area set by said setting means, and display means for displaying the enlarged area changed by said changing means. Imaging device. 3. The image pickup apparatus with electronic telephoto according to claim 1, wherein switching between standard photographing and electronic telephoto photographing is performed by a signal synchronized with a vertical drive pulse.