JPH04363981A - Video camera - Google Patents

Abstract

PURPOSE:To recognize a picture border of a photo cameras accurately even when a zoom magnification is changed. CONSTITUTION:A video camera section and a photo camera section are arranged integrally in a cabinet. A zoom lens is employed for an image pickup lens 2 of the video camera and for an image pickup lens 3 of a photo camera. Variable resistors 44, 48 are arranged to the image pickup lenses 2, 3 to apply detection signals SDv, SDp to a controller 27. The picture border ratio of the image pickup pattern and the photo camera pattern differs from the zoom magnification. A data Ds used for controlling a display size of an image pickup pattern displayed on an EVF is outputted from the controller 27 depending on the picture border ratio. A glass plate on which displays a picture frame of the photo camera is arranged onto the screen of the EVF. The image pickup pattern is displayed variably onto the screen of the EVF based on the picture frame of the photo camera. Even when the zoom magnification is changed, the picture border of the photo camera is accurately recognized and the user surely implements the shutter operation and the zoom operation of the photo camera while observing the display pattern of the EVF.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera having a zoom function and an electronic viewfinder.

0002

2. Description of the Related Art By using a video camera, it is possible to capture not only moving images but also still images. However, the resolution of a video camera is lower than that of a photo camera (film camera), and it is often desired to use a photo camera together with a video camera. For example, it is conceivable to fix a photo camera to a video camera and operate the shutter of the photo camera while capturing a moving image with the video camera.

[0003] In this case, if the image frame of the photo camera is displayed on the electronic viewfinder of the video camera, the user can recognize the image area of the photo camera using the electronic viewfinder, and can perform shutter and zoom operations accurately. be able to.

0004

By the way, in a video camera having a zoom function, when the zoom magnification changes, the angle of view of the image capturing screen changes. This also applies to photo cameras that have a zoom function. Therefore, as the zoom magnification of the video camera or photo camera changes, the positional relationship between the imaging screen and the image frame of the photo camera changes.

[0005] Accordingly, the present invention is intended to enable accurate recognition of the field of view of a photo camera even when the zoom magnification changes.

[0006]

[Means for Solving the Problems] The present invention provides an image frame display means for displaying the image frame of a photo camera having a zoom function on the screen of the electronic view finder in a video camera having a zoom function and an electronic view finder. and display size changing means for changing the display size of the image capture screen of the electronic viewfinder in accordance with changes in the angle of view due to changes in zoom magnification, and display size changing means for changing the display size of the image capture screen of the electronic viewfinder in accordance with changes in the angle of view due to changes in zoom magnification. It is to be displayed.

[0007]

[Operation] As the zoom magnification of the video camera becomes lower or higher, its angle of view becomes larger or smaller, and the display size of the image capturing screen becomes larger or smaller. On the other hand, when the zoom magnification of a photo camera becomes low or high, its angle of view becomes large or small, and the display size of the imaging screen becomes small or large. In other words, the display size of the imaging screen changes in accordance with the change in zoom magnification.

[0008] According to the above-mentioned configuration, since the image capture screen is displayed on the electronic viewfinder based on the image frame of the photo camera of a certain size, the image field of the photo camera can be accurately recognized, and the user can use the electronic viewfinder as a reference. The shutter and zoom operations of the photo camera can be accurately performed while looking at the display screen.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this example, a video camera and a photo camera are integrally formed.

FIG. 1 is a perspective view showing the overall configuration. In the figure, 1 is a cabinet. Although not shown, the cabinet 1 includes a video camera section including an image sensor, a signal processing circuit, etc., and a photo camera section including a film loading mechanism, a film drive mechanism, etc.

2 is an imaging lens of the video camera section;
3 is an imaging lens of the photo camera section. That is, the optical systems of the video camera section and the photo camera section are configured separately. As the imaging lens 2, the focal length f is 7 mm to 42 m.
A 6x zoom lens of m is used. On the other hand, as the imaging lens 3, a 3x zoom lens with a focal length f of 35 mm to 105 mm is used.

Further, in this example, an electronic viewfinder made of a small CRT is provided in the cabinet 1.
A screen imaged by a video camera unit via an imaging lens 2 is displayed on RT. 4 is an eye cup. In addition,
A finder for directly checking the screen imaged by the photo camera section through the imaging lens 3 is not provided.

Further, 5T and 5W are zoom operation buttons for zooming in the TELE direction and WIDE direction, respectively. Reference numeral 6 indicates a recording button for recording an imaged video signal outputted from the video camera section onto a VTR, and 7 indicates a shutter button of the photo camera section. Furthermore, 8 is a film rewind button.

FIG. 2 shows the configuration of the video camera section. Image light from a subject is supplied via an imaging lens 2 and an iris 11 to a single-chip CCD solid-state image sensor 12 having a complementary color checkerboard color filter.

FIG. 3 is a schematic color coding diagram of this image sensor 12. As shown in the figure, field reading is performed. In the A field, charges are mixed in pairs such as A1 and A2, and in the B field, charges are mixed in pairs such as B1 and B.
Charges are mixed in pairs such as 2. Then, from the horizontal shift register Hreg, in the A field, A1, A2
,... In the B field, B1, B2,...
Charges are output in this order.

Here, the order of charges a, b, . . . is (Cy+G) on line A1, as shown in FIG.
, (Ye+Mg),..., and on the A2 line, (Cy+Mg), (Ye+G),..., and B
In one line, (G+Cy), (Mg+Ye),
..., and in the B2 line, (Mg+Cy)
, (G+Ye), .

The charges output from the image sensor 12 as described above are supplied to a CDS circuit (correlated double sampling circuit) 13, and taken out from the CDS circuit 13 as an image signal. By using this CDS circuit 13,
As is well known, reset noise can be reduced.

Timing pulses necessary for the image sensor 12 and the CDS circuit 13 are supplied from a timing generator 14. The timing generator 14 has 8 signals from the oscillator 15.
Reference clock C of fsc (fsc is color subcarrier frequency)
K0 is supplied, and horizontal and vertical synchronization signals HD and VD are supplied from the synchronization generator 16. On the other hand, the synchronous generator 16 is supplied with a 4 fsc clock CK1 from the timing generator 14.

The imaging signal output from the CDS circuit 13 is supplied to a level detection circuit 17, and the output signal of this detection circuit 17 is supplied to an iris driver 18. and,
The aperture of the iris 11 is automatically controlled by the iris driver 18.

Here, processing for obtaining a luminance signal Y and a chroma signal (color difference signal) from the image pickup signal output from the CDS circuit 13 will be explained.

The luminance signal Y is obtained by adding adjacent signals together. In FIG. 4, a+b, b+
Addition signals c, c+d, d+e, . . . are formed in order.

For example, the A1 line is approximated by the following equation. Here, Cy=B+G, Ye=R+G, Mg
=B+R.

Y={(Cy+G)+(Ye+Mg))}×1/2=(
2B+3G+2R)×1/2 Furthermore, on the A2 line, it is approximated by the following equation.

Y={(Cy+Mg)+(Ye+G))}×1/2=(
2B+3G+2R)×1/2 The other lines of the A field and the lines of the B field are similarly approximated.

The chroma signal is obtained by subtracting adjacent signals.

For example, the A1 line is approximated by the following equation.

RY=(Ye+Mg)-(Cy+G)=
(2RG-G) Also, on the A2 line, it is approximated as shown in the following equation.

−(B−Y)=(Ye+G)−(Cy−Mg)=−(2
B-G) Regarding the other lines of the A field and the lines of the B field, the red difference signal RY and the blue difference signal -(B-Y) are obtained alternately line-sequentially in the same way.

Returning to FIG. 2, the image signal output from the CDS circuit 13 is supplied via the AGC circuit 19 to a low-pass filter 20 constituting a brightness processing section. The low-pass filter 20 performs addition processing (averaging) of adjacent signals. Therefore, this low-pass filter 20
A luminance signal Y is outputted from.

Further, the image signal outputted from the AGC circuit 19 is supplied to sample and hold circuits 21 and 22 forming a chroma processing section. sample hold circuit 21,
22 are supplied with sampling pulses SHP1 and SHP2 (shown in E and F in FIGS. 5 and 6) from the timing generator 14.

From the sample hold circuit 21, (Cy
+G) or (Cy+Mg) continuous signal S1 is output and supplied to the subtracter 23 (as shown in FIGS. 5B and 6B). From the sample hold circuit 22, (Ye+Mg)
Alternatively, a continuous signal S2 of (Ye+G) is output and supplied to the subtracter 23 (as shown in FIGS. 5C and 6C).

The subtracter 23 subtracts the signal S1 from the signal S2. Therefore, the subtracter 23 outputs a red difference signal R-Y and a blue difference signal -(B-Y) alternately in a line-sequential manner (as shown in FIGS. 5D and 6D).

The color difference signal output from the subtracter 23 is directly supplied to the fixed terminal on the b side of the changeover switch 24 and the fixed terminal on the a side of the changeover switch 25, and is also supplied to a delay circuit having a delay time of one horizontal period. The signal is supplied to the a-side fixed terminal of the change-over switch 24 and the b-side fixed terminal of the change-over switch 25 via the changeover switch 26 .

Switching of the changeover switches 24 and 25 is controlled by a controller 27. That is, one horizontal period during which the red difference signal RY is output from the subtracter 23 is b.
On the other hand, one horizontal period during which the blue color difference signal -(B-Y) is output is connected to the a side. Note that the controller 27 is supplied with the synchronization signals HD and VD from the synchronization generator 16 as reference synchronization signals, and is also supplied with the clock CK1 from the timing generator 14.

Since the changeover switches 24 and 25 are changed over as described above, the changeover switch 24 outputs the red difference signal RY in each horizontal period, and the changeover switch 25 outputs the blue difference signal -( B-Y) is output.

The luminance signal Y output from the low-pass filter 20 and the color difference signals (RY) and -(B-Y) output from the changeover switches 24 and 25 are supplied to an encoder 28. The encoder 28 is supplied with a composite synchronization signal SYNC, a blanking signal BLK, a burst flag signal BF, and a color subcarrier signal SC from the synchronization generator 16.

In the encoder 28, as is well known, a synchronizing signal SYNC is added to the luminance signal Y, and a color difference signal is subjected to quadrature two-phase modulation to form a carrier color signal C, and a color burst signal is added. . and,
These luminance signal Y and carrier color signal C are added to form, for example, an NTSC color video signal. The color video signal SCV output from the encoder 28 in this manner is led to the output terminal 29.

Further, the encoder 28 outputs a black-and-white video signal SV (luminance signal Y to which a synchronizing signal SYNC is added), and this black-and-white video signal SV is supplied to the electronic viewfinder 30. Then, the image capture screen is displayed on the small CRT constituting the electronic viewfinder 30.

Further, the zoom magnification of the imaging lens 2 is adjusted by a zoom driver 41. FIG. 7 shows a specific configuration of the zoom driver 41. In the figure, 411 is a lens constituting the imaging lens 2,
This is for adjusting the zoom magnification. This lens 4
The zoom magnification is adjusted by moving the position 11 back and forth with a rotational drive. For example, rotating it toward the T side adjusts it in the TELE direction, while rotating it toward the W side adjusts it in the WIDE direction.

This lens 411 is rotationally driven by a DC motor 412. One end and the other end of this motor 412 are connected to output terminals q1 and q2 of a zoom driver section 413, respectively. Input terminals p1 and p2 of the zoom driver section 413 are connected to changeover switches 45 and 4, respectively.
It is connected to fixed terminals on the T side and W side of the zoom operation switch 42 via the V side of the zoom operation switch 42 .

The switching of the changeover switches 45 and 46 is carried out by a zoom operation selection button (not shown in FIG. 1) arranged on the cabinet 1. For example, when the zoom operation selection button is not pressed, it is connected to the v side, On the other hand, when pressed, it is connected to the p side.

When a high level "H" signal is supplied to the terminal p1 of the zoom driver section 413, current flows to the motor 412 in the direction from the terminal q1 to the terminal q2 (as shown by the solid line), and the lens 411 moves in the T direction. Rotationally driven. Conversely, when a high level "H" signal is supplied to the terminal p2, the motor 41 moves in the direction from the terminal q2 to the terminal q1.
A current flows through the lens 411 (indicated by a broken line), and the lens 411 is driven to rotate in the W direction. Note that when a high level "H" signal is not supplied to either terminal p1 or p2, the motor 4
No current flows through lens 412, lens 411 is not rotationally driven in any direction, and its position is maintained.

A movable terminal of the zoom operation switch 42 is connected to a power supply terminal. Cabinet 1 operation buttons 5T, 5W
When pressing , the zoom operation switch 42 is
side, W side. When the operation buttons 5T and 5W are pressed without pressing the zoom operation selection button, a high level "H" is applied to the terminals p1 and p2 of the zoom driver section 413, respectively.
" signal is supplied, and zoom adjustment is performed in the TELE direction and WIDE direction.

Further, as shown in FIG. 2, a variable resistor 44 constituting a potentiometer is arranged at the mounting position of the lens 411 of the imaging lens 2. The movable element position of the variable resistor 44 is configured to be shifted by rotation of the lens 411, and a voltage corresponding to the zoom magnification is obtained at the movable element, and this is supplied to the controller 27 as a detection signal SDv. As shown in FIG. 8, the detection signal SDv is set to, for example, 1V at the WIDE end (f=7 mm) and 4V at the TELE end (f=42 mm).

Further, the zoom magnification of the imaging lens 3 is adjusted by a zoom driver 47. FIG. 9 shows a specific configuration of the zoom driver 47. Since this zoom driver 47 has the same configuration as the zoom driver 41 described above, corresponding parts are given the same reference numerals and detailed explanation will be omitted.

Zoom driver section 4 of zoom driver 47
13 input terminals p1 and p2 are respectively connected to the changeover switch 4.
It is connected to fixed terminals on the T side and W side of the zoom operation switch 42 via the p side of the zoom operation switch 42 .

When the operation buttons 5T and 5W of the cabinet 1 are pressed, the zoom operation switch 42 is moved to the T side and the W side, respectively.
connected to the side. When the operation buttons 5T and 5W are pressed while the zoom operation selection button is pressed, a high level "H" signal is supplied to the terminals p1 and p2 of the zoom driver section 413, respectively, and the zoom adjustment is performed in the TELE direction and the WIDE direction. It is done.

Further, as shown in FIG. 2, a variable resistor 48 constituting a potentiometer is arranged at the mounting position of the lens 411 of the imaging lens 3. The position of the movable element of the variable resistor 48 is configured to be shifted by rotation of the lens 411, and a voltage corresponding to the zoom magnification is obtained at the movable element, and this is supplied to the controller 27 as a detection signal SDp. As shown in FIG. 10, the detection signal SDp is, for example, 1V at the WIDE end (f=35mm), and the TEL
The voltage is set to 4V at the E end (f=105mm).

In this example, the image frame 30 of the photo camera is placed above the small CRT screen 301 of the viewfinder 30.
A glass plate 303 displaying 2 is arranged in close contact with each other (Fig. 1
(see 7). Then, an imaging screen 304 is displayed using the image frame 302 of this photo camera as a reference. In this case, the angle of view of the video camera and the photo camera changes according to the zoom magnification, and therefore the field of view changes, so the display size of the imaging screen 304 is changed according to the change in the zoom magnification. In order to change the display size, it is necessary to find the ratio between the field of view of the photo camera and the field of view of the imaging screen.

The angle of view will now be explained using FIG. 11. The angle of view θ is the imaging surface size T and the f value (focal length)
From this, it can be obtained as shown in Equation 1. Note that in FIG. 11, T' is the field of view, and L is the object distance.

[0051]

[Equation 1] θ=2tan-1T/2f The imaging lens 2 is a 6x zoom lens with f=7 mm to 42 mm. When the image sensor 12 is 1/3 inch, the horizontal size ZH of the imaging surface is 4.9 mm, the vertical size ZV is 3.69 mm, and the diagonal size ZD is 6.
．． It is 13 mm (see Figure 12).

Therefore, the horizontal and vertical angles of view θZH and θZV at the WIDE end (f=7 mm) are 38.6° and 29.5°, respectively. On the other hand, the horizontal and vertical viewing angle θ at the TELE end (f = 42 mm)
ZH and θZV are 6.7° and 5.0°, respectively.

Furthermore, the imaging lens 3 has f=35 mm to 10
It is a 5mm 3x zoom lens. The film is 35mm
, the horizontal size PH of the imaging surface is 36
mm, the vertical size PV is 24 mm, and the diagonal size PD is 43.3 mm (see FIG. 13).

Therefore, the horizontal and vertical angles of view θPH and θPV at the WIDE end (f=35 mm) are 54.4° and 37.8°, respectively. On the other hand, TELE
The horizontal and vertical viewing angles θPH and θPV at the end (f = 105 mm) are 19.5° and 13.0°, respectively.
becomes.

From the above, the relationship between the angles of view of the imaging lens 2, which is a zoom lens, and the imaging lens 3, which is a zoom lens, is as shown in Table 1.

[0056]

[Table 1]

Next, the field of view ratio between the imaging screen and the photo camera will be explained. From FIG. 11, the field of view T' can be determined as shown in Equation 2.

[0058]

[Equation 2] T'=2Ltan θ/2 If the object distance L between the imaging lens 2 of the video camera section and the imaging lens 3 of the photo camera section is equal, it can be seen that the field of view ratio changes depending on the angle of view θ.

Here, since the horizontal and vertical field angles θZH and θZV of the imaging screen are shown in Table 1, the horizontal and vertical field of view T'ZH and T'ZV at the WIDE end are
are 0.7L and 0.53L respectively, while TELE
Horizontal and vertical field of view at the edge T'ZH, T'Z
V becomes 0.12L and 0.09L, respectively.

The viewing angles θZH and θZV of the imaging screen other than the WIDE end and the TELE end are calculated based on the detection signal SDv using the formula 3.
It can be obtained as shown below.

[0061]

[Math. 3] θZH=38.6°-(38.6°-6.7°)(
SDv-1)/3 θZV=29.5°-(29.5
°-5.0°)(SDv-1)/3 By substituting the angles of view θZH and θZV obtained from equation 3 into θ of equation 2, the fields of view T'ZH and T'ZV can be obtained. Can be done.

Furthermore, since the horizontal and vertical viewing angles θPH and θPV of the photo camera are shown in Table 1, WIDE
Horizontal and vertical picture fields T'PH, T'P at the edges
V is 1.03L and 0.69L, respectively, while TE
Horizontal and vertical field of view T′PH,T at the LE end
'PV is 0.34L and 0.23L, respectively.

The viewing angles θPH and θPV of the imaging screen other than the WIDE end and the TELE end are calculated based on the detection signal SDp using the formula 4.
It can be obtained as shown below.

[0064]

[Equation 4] θPH=54.4°-(54.4°-19.5°)
(SDp-1)/3 θPV=37.8°-(37.
8°-13.0°) (SDp-1)/3 By substituting the angles of view θPH and θPV found by this equation 4 into θ in equation 2, find the fields of view T'PH and T'PV. be able to.

From the above, the relationship between the field of view of the imaging screen and the field of view of the photo camera is as shown in Table 2. FIG. 14 shows the field relationship in the horizontal direction, and FIG. 15 shows the field relationship in the vertical direction.

[0066]

[Table 2]

[0067] Also, the field of view ratio T'Z in the horizontal direction and vertical direction
H/T'PH and T'ZV/T'PV are as shown in Table 3.

[0068]

[Table 3]

Note that the image field T' can also be obtained from FIG. 11 as shown in Equation 5.

[0070]

[Equation 5] T'=L×T/f The focal length f of the imaging lens 2 can be determined as shown in Equation 6 based on the detection signal SDv.

[0071]

[Math. 6] f=7mm+(42mm-7mm)(SDv-1)/3
By substituting the focal length f obtained from Equation 6 into Equation 5, and further substituting the horizontal size ZH and vertical size ZV of the imaging surface for T in Equation 5, the horizontal and vertical field of view T can be obtained, respectively. 'ZH, T'ZV can be obtained.

Further, the focal length f of the imaging lens 3 can be determined as shown in Equation 7 based on the detection signal SDp.

[0073]

[Math. 7] f=35mm+(105mm-35mm)(SDp-1
)/3 By substituting the focal length f obtained by this equation 7 into equation 5, and further substituting the horizontal size PH and vertical size PV of the imaging plane for T in equation 5, the horizontal direction,
The vertical field of view T'PH and T'PV can be determined.

Returning to FIG. 2, the controller 27 controls the image capture screen 304 displayed on the small CRT screen 301 of the viewfinder 30 according to the horizontal and vertical field of view ratio T.
Size data Ds for making the display size according to 'ZH/T'PH and T'ZV/T'PV is formed.

FIG. 16 is a flowchart showing size data output processing in the controller 27. First, the focal length f of the imaging lens 2 is calculated from the detection signal SDv using Equation 6 (step 51).

Next, by substituting this focal length f into Equation 5, and substituting the horizontal size ZH and vertical size ZV of the imaging surface for T in Equation 5, the images in the horizontal and vertical directions of the imaging screen are obtained. Calculate the fields T'ZH and T'ZV (step 52
).

Next, the focal length f of the imaging lens 3 is calculated from the detection signal SDp using Equation 7 (step 53).
.

Next, by substituting this focal length f into Equation 5, and substituting the horizontal size PH and vertical size PV of the imaging plane for T in Equation 5, the images in the horizontal and vertical directions of the imaging screen are calculated. Calculate the fields T'PH and T'PV (step 54
).

Next, this image field T'ZH, T'ZV, T'
Using PH, T'PV, calculate the field of view ratio T'ZH/T'PH, T' in the horizontal and vertical directions of the imaging screen and the photo camera.
ZV/T'PV is calculated (step 55).

[0080] Then, this field ratio T'ZH/T'PH,
Size data Ds is output according to T'ZV/T'PV (step 56). This size data Ds is data for controlling the horizontal and vertical deflection angles of the small CRT of the viewfinder 30.

The size data Ds output from the controller 27 is supplied to the viewfinder 30. The display size in the horizontal and vertical directions of the imaging screen 304 is determined by the field of view ratio T' with the image frame 302 of the photo camera as a reference.
It is controlled to be equal to the size shown by ZH/T'PH and T'ZV/T'PV.

In this case, the display size in the vertical direction is determined by changing the amplitude of the sawtooth signal using a vertical drive circuit, for example.
It is controlled by changing the amplitude of the current flowing through the vertical deflection coil. On the other hand, the display size in the horizontal direction is controlled by changing the capacitance of the resonant capacitor of the horizontal output circuit and changing the amplitude of the current flowing through the horizontal deflection coil.

Although a detailed explanation will be omitted, as the horizontal and vertical deflection angles become smaller, the scanning time of the CRT electron beam remains the same, the scanning width becomes shorter, and the energy on the phosphor screen increases, so the contrast is reduced. It is configured to be lowered to protect the fluorescent screen.

FIG. 18 shows a small C viewfinder 30.
An RT screen 301 is shown, and with respect to an image frame 302 of a photo camera having a fixed size, an imaging screen 304 has a display size according to the zoom magnification.

As described above, in this example, the small CRT screen 301 of the viewfinder 30 has an imaging screen 304 based on the image frame 302 of the photo camera of a certain size.
is displayed, so even if the zoom magnification changes, the field of view of the photo camera can be accurately recognized. therefore,
The shutter operation and zoom operation of the photo camera can be performed accurately while looking at the display screen of the viewfinder 30.

[0086] In the above embodiment, the video camera and photo camera are integrated, but the present invention is also applicable to a type in which a separate photo camera is fixed to the video camera. be able to. in this case,
For example, a means is provided for inputting data on the field of view T'PH, T'PV of a photo camera (data on angles of view θPH, θPV, or data on focal length f and imaging surface size PH, PV of the film) to the controller 27. By that,
It can be used with any type of photo camera.

Furthermore, in the above-mentioned embodiment, the zoom operation buttons 5T and 5W (zoom operation switch 42) are used in common for the zoom operation of the imaging lenses 2 and 3, but it is also possible to provide dedicated operation buttons for each one. good.

Furthermore, in the above embodiment, the image frame 302 of the photo camera is displayed by closely placing the glass plate 303 on the screen 301 of the CRT. It is also possible to draw the image frame 302 directly.

[0089]

Effects of the Invention According to the present invention, since the image capturing screen is displayed on the electronic viewfinder based on the image frame of the photo camera of a fixed size, the image field of the photo camera can be accurately displayed even if the zoom magnification changes. The user can accurately operate the shutter and zoom of the photo camera while looking at the display screen of the electronic viewfinder.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment.

FIG. 2 is a diagram showing the configuration of a video camera section.

FIG. 3 is a schematic diagram of color coding.

FIG. 4 is a diagram showing the output of a horizontal output register.

FIG. 5 is a diagram for explaining color signal processing.

FIG. 6 is a diagram for explaining color signal processing.

FIG. 7 is a diagram showing the configuration of a zoom driver of the video camera section.

FIG. 8 is a diagram showing the relationship between the zoom angle of view of the video camera section and the detection signal.

FIG. 9 is a diagram showing the configuration of a zoom driver of the photo camera section.

FIG. 10 is a diagram showing the relationship between the zoom angle of view of the photo camera section and the detection signal.

FIG. 11 is a diagram for explaining how to obtain the angle of view.

FIG. 12 is a diagram showing the size of the imaging surface of a 1/3-inch CCD solid-state imaging device.

FIG. 13 is a diagram showing the size of the imaging surface of a 35 mm film.

[Figure 14] Field of view of imaging screen and photo camera (horizontal direction)
FIG.

[Figure 15] Field of view of imaging screen and photo camera (vertical direction)
FIG.

FIG. 16 is a flowchart showing the size data output processing operation.

FIG. 17 is a diagram showing a frame display glass plate.

FIG. 18 is a diagram showing a display screen of an electronic viewfinder.

[Explanation of symbols]

1 Cabinet 2, 3 Imaging lens 4 Eye cup 5T, 5W Zoom operation button 6 Record button 7 Shutter button 12 CCD solid-state image sensor 14 Timing generator 16 Synchronous generator 20 Low pass filter 21, 22 Sample and hold circuit 23 Subtractor 24, 25 Selector switch 26 Delay circuit 27 Controller 28 Encoder 29 Output terminal 30 Electronic viewfinder 41, 47 Zoom driver 42 Zoom operation switch 44, 48 Variable resistor 301 CRT screen 302 Photo camera image frame 303 Glass plate for displaying picture frame 304 Imaging screen

Claims (1)

[Claims] 1. A video camera having a zoom function and an electronic viewfinder, comprising an image frame display means for displaying an image frame of a photo camera having a zoom function on the screen of the electronic viewfinder, and a change in zoom magnification. and display size changing means for changing the display size of the image capture screen of the electronic viewfinder in accordance with a change in the angle of view caused by the display, and display the image capture screen on the screen of the electronic viewfinder with reference to the image frame of the photo camera. A video camera featuring: